IB vs A Levels vs AP: Which Curriculum Is Right for an International Family?
The IB Diploma, A Levels and Advanced Placement are the three upper-secondary routes most international families meet. They are built very differently, are not equivalent to one another, and suit different children and different plans. This guide explains how each one works, what changes if you move country, and where ESG's own school records show each is offered.
Quick answer
IB vs A Levels vs AP compared for international families: structure, assessment, breadth vs specialisation, university entry, moving country, and where ESG schools offer each.
At a glance
- Coverage: Worldwide
- Sections: 11
- Questions answered: 7
- Schools listed: 16
- Read time: 14 min read
The short version
The IB Diploma Programme is a single two-year programme: six subjects across set subject groups, plus a compulsory core. A Levels are individual subject qualifications, usually studied over two years, where most students take three or four subjects in depth. Advanced Placement (AP) is a set of individual college-level courses and exams that students add, one subject at a time, to a US-style high school programme.
None of the three is universally "better" or "easier", none guarantees a university place, and they are not interchangeable. Universities assess each on its own terms. The right choice depends on your child's strengths, how settled or mobile your family expects to be over the final two to four years of school, and the countries where your child is likely to apply to university.
What the IB Diploma Programme is
IB Diploma at a glance (official IB information)
- Two-year programme, typically ages 16–19
- Six subjects across subject groups, usually three or four at Higher Level
- Compulsory core: Theory of Knowledge, Extended Essay, CAS
- Scored out of 45: 1–7 per subject plus up to 3 core points
The International Baccalaureate (IB) is a non-profit foundation that authorises schools to teach its programmes. It runs four: the Primary Years Programme (typically ages 3–12), the Middle Years Programme (typically 11–16), and two options for ages 16–19 — the Diploma Programme (DP) and the Career-related Programme (CP). When families compare "IB vs A Levels vs AP", they almost always mean the Diploma Programme.
DP students take six subjects drawn from different subject groups (languages, humanities, sciences, mathematics and the arts, with some flexibility on the arts). Normally three or four are taken at Higher Level and the rest at Standard Level. Around those subjects sits a compulsory core: Theory of Knowledge, the Extended Essay (an independent research paper) and Creativity, Activity, Service (CAS).
Each subject is graded 1–7, and up to three further points come from Theory of Knowledge and the Extended Essay, giving a maximum of 45. Assessment combines final examinations with internally assessed coursework that is externally moderated. Students who do not take the full Diploma can, at many schools, take individual DP courses and receive course results instead.
What A Levels are
A Levels at a glance (awarding-body information)
- Individual subject qualifications, typically ages 16–18
- Most students take three subjects, some take four
- Graded A* to E
- International schools usually use Cambridge International or Pearson Edexcel International specifications
A Levels (Advanced Level qualifications) are single-subject qualifications from the English education system, usually studied over the final two years of school, at roughly ages 16–18. There is no compulsory core and no required spread of subjects: students choose the subjects they want to specialise in, most commonly three, sometimes four. Grades run from A* to E.
International schools mostly teach A Levels set by international awarding bodies, chiefly Cambridge International (Cambridge International AS & A Level) and Pearson Edexcel (International A Level), rather than the versions taught in schools in England. The structures differ. Cambridge International allows the AS Level to be taken as a first stage that can count towards the full A Level. Pearson Edexcel International A Levels are modular, with units that can be sat in different exam sessions. In England, by contrast, A Levels are linear, and the AS is a separate, standalone qualification.
Assessment is mainly by written examination. Some subjects, such as the sciences and art, include practical or coursework components, depending on the awarding body and subject.
What Advanced Placement (AP) is
AP at a glance (official College Board information)
- Individual college-level courses, each with its own exam
- Exams scored 1–5, usually sat in May
- Taken within a US-style high school programme; the school awards the diploma
- Optional AP Capstone and AP International Diploma awards
Advanced Placement is run by the College Board, the US non-profit organisation that also runs the SAT. AP is not a curriculum or a diploma in its own right: it is a catalogue of individual college-level courses, each ending in an AP Exam that is usually sat in May. Exams are scored from 1 to 5.
Students usually take AP courses in the last two or three years of a US-style high school programme, alongside the school's own graduation requirements. The school awards the high school diploma, not the College Board. How many AP courses a student takes, and which ones, depends on what the school offers and on the student.
The College Board also offers two optional awards built from AP Exams. AP Capstone is based on two dedicated courses, AP Seminar and AP Research. The AP International Diploma is for students applying to universities outside the US. Each has its own requirements, set out on the College Board's website.
How the three compare
The table below summarises structural differences, based on official programme information. It describes how each system is designed, not how hard it is or how well it is regarded. Those questions depend on the student, the school and the university.
- Who runs it: IB — International Baccalaureate Organization; A Levels — exam boards such as Cambridge International and Pearson Edexcel; AP — College Board
- What it is: IB — one integrated two-year diploma; A Levels — separate subject qualifications; AP — separate courses added to a high school programme
- Typical number of subjects: IB — six plus the core; A Levels — usually three, sometimes four; AP — varies widely by school and student
- Breadth: IB — required spread across subject groups; A Levels — free choice, usually specialised; AP — depends on the wider high school programme
- Compulsory extras: IB — Theory of Knowledge, Extended Essay, CAS; A Levels — none; AP — none (AP Capstone is optional)
- Grading: IB — 1–7 per subject, total out of 45; A Levels — A* to E per subject; AP — 1–5 per exam
- Assessment: IB — exams plus moderated internal assessment; A Levels — mainly exams, some coursework or practicals; AP — mainly the end-of-course exam
- Where the leaving qualification comes from: IB — the IB awards the Diploma; A Levels — the exam board awards each A Level; AP — the school awards the diploma, and the College Board reports AP scores
IB grades, A Level grades and AP scores do not convert neatly into one another. Universities publish their own entry requirements for each system, and those requirements are where any comparison should come from.
Breadth versus specialisation
This is usually the most useful question for parents.
The IB Diploma keeps students studying languages, a humanity, a science and mathematics until the end of school, alongside the core. It can suit students who are strong across several areas, or who do not yet know what they want to study. It asks a lot of students who strongly dislike one of the required groups.
A Levels let students drop subjects they do not need and concentrate on three or four. They can suit a student who already knows, for example, that they want to study medicine, engineering or history, and who does best when going deep. They are less suitable for a student who wants to keep a wide range of options open.
AP adds depth one subject at a time on top of a broader high school programme, so breadth comes from the high school's own graduation requirements and depth from the number and choice of APs. That flexibility suits some students well. It also means that two students with "AP" on their transcripts can have taken very different programmes.
This is editorial guidance rather than an official position: none of these patterns applies to every child, and a good school's guidance team should help you think it through for yours.
University applications
Universities in many countries accept all three, but each university and course sets its own requirements, and those requirements differ by system. There is no rule that universities in general prefer one curriculum, and no curriculum guarantees admission.
Some points to check, depending on where your child may apply:
- UK universities publish separate entry requirements for A Levels and the IB Diploma for each course. For AP, they usually set their own requirements, often a number of AP Exams at specified scores alongside the high school diploma. Check each course page.
- US colleges routinely see all three. AP scores, IB results and A Level results may earn credit or advanced placement at some institutions, but credit policies are set by each college and vary.
- In other countries, recognition rules for foreign school-leaving qualifications are set nationally or by individual universities, and some specify required subjects or levels (for example, particular subjects at IB Higher Level). Check the official admissions or recognition authority for each country your child is considering.
For any specific university or course, the university's own published requirements are the authority, not this guide and not a school's marketing material.
Moving country during the final years of school
For internationally mobile families, the timing of a move matters as much as the curriculum.
The IB Diploma uses the same framework at every IB World School, which can make it easier to continue in another country if your child moves between two IB schools. Even so, schools offer different subjects and levels, so an exact match is not guaranteed. A move part-way through the two-year Diploma needs agreement from both schools on subject choices and on coursework already completed.
A Levels are set by different awarding bodies with different specifications. A move between schools using the same board and syllabus is usually simpler than a switch between boards. Under modular international specifications, completed units may carry over, but check this with the new school and the awarding body before you commit to a move.
AP courses are self-contained, and exam scores remain valid wherever the student moves. The high school diploma, however, depends on the receiving school accepting earlier credits towards its own graduation requirements.
Whatever the system, ask both the current and the receiving school, in writing, how your child's completed work will be recognised before committing to a mid-programme move. If a move during the final two years is likely, that may be a stronger factor in choosing a curriculum than any difference in teaching style.
Where ESG schools offer each
These figures come from ESG's own directory: 1,878 schools as at October 2026. A school is counted only when its ESG curriculum record explicitly names the qualification. We do not count a school as AP because it is American, as offering A Levels because it is British, or as IB because it calls itself international. Many schools' records give only a broad label such as "British" or "American", so these are minimum counts of explicitly recorded provision, not market totals.
- IB: 759 schools in 72 countries
- A Levels: 64 schools in 25 countries
- AP: 38 schools in 21 countries
- Schools whose record names two or more of the three: 30
- Countries with at least one ESG school recording each of the three: 14
The A Level and AP figures are much lower than the IB figure partly because of how schools describe themselves. IB World Schools nearly always name the IB, whereas many British and American curriculum schools list only "British" or "American" and do not name A Levels or AP individually. Always confirm a specific school's current upper-secondary offer directly with the school.
The schools listed further down are examples of schools whose records explicitly name these qualifications, chosen to show the range of combinations across different countries. Listing a school here is not a ranking or a recommendation.
Questions to ask a school before choosing
- Which upper-secondary qualifications do you offer now, and are any being introduced or withdrawn?
- For the IB: do you offer the full Diploma, individual DP courses, or both? Which subjects can be taken at Higher Level?
- For A Levels: which awarding body and specification do you use for each subject, and how many subjects do students normally take?
- For AP: which AP courses run each year, and is there a minimum class size before a course runs?
- What did your recent leavers achieve, and where did they apply? Ask for the actual figures rather than highlights.
- How do you advise students applying to the countries we are considering?
- If we move during the final two years, how will you help with the transfer, and how have you handled incoming mid-programme students?
- What happens if my child struggles with one required subject or component?
Sources
Programme descriptions on this page are summarised from the official websites of the organisations that run each qualification, current at the time of writing. Check them directly for the latest rules:
- International Baccalaureate — Diploma Programme: ibo.org/programmes/diploma-programme
- Cambridge International — Cambridge International AS & A Level: cambridgeinternational.org
- Pearson Edexcel — International Advanced Level: qualifications.pearson.com
- College Board — AP Students and AP Central: apstudents.collegeboard.org and apcentral.collegeboard.org
- UCAS — entry requirements and international qualifications: ucas.com
School figures and examples come from ESG's directory records. Where we give an opinion rather than a fact, the text says so.
Frequently Asked Questions
Is the IB harder than A Levels or AP?
There is no objective answer. The IB Diploma requires breadth across six subjects plus the core, while A Levels require depth in fewer subjects, and AP difficulty depends on how many courses a student takes. A student who dislikes one of the IB's required subject groups may find the Diploma harder; a student who wants to specialise may find A Levels a better fit.
Do universities prefer one of the three?
Universities set their own requirements for each system, and many accept all three. Requirements differ by university, course and country, so check the published entry requirements for the specific courses your child is considering.
Is AP the same as A Levels?
No. AP courses are individual college-level courses taken within a US-style high school programme and scored 1–5. A Levels are standalone English-system subject qualifications graded A* to E. They are designed differently, and universities treat them separately.
Is the IB Diploma equivalent to A Levels?
Not directly. They are different qualifications with different structures and grading. Universities publish separate offers for each, and there is no single conversion that every university uses.
Which is best if we may move country again?
It depends on where and when you might move. Moving between two IB schools can be easier because the framework is shared, but subject availability still varies. A Level moves are simplest within the same awarding body. AP scores remain valid wherever you move, but the high school diploma depends on the receiving school accepting earlier credits. Ask both schools in writing before a move.
Can a school offer more than one of these?
Yes. In ESG's directory, 30 school records explicitly name two or more of the three. Some schools offer the IB Diploma alongside AP, or A Levels alongside the IB. Ask exactly which routes are available in your child's year group.
Why does ESG list fewer A Level and AP schools than IB schools?
We count a school only when its record explicitly names the qualification. Many British and American curriculum schools describe themselves only as "British" or "American" without naming A Levels or AP, so our A Level and AP figures are minimum counts, not market totals.