"The IB is much harder than A-levels" is something you will hear from IB students fairly regularly. "A-levels are harder because they go deeper" is what A-level students tend to say. Both have a point. The honest answer is that they are hard in different ways — and understanding that difference matters for the choices you make.
The fail rate comparison
The most revealing single number is the fail rate.
In May 2024:
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Review my statement → From €7.49 · Results in under 10 min- IB Diploma fail rate: approximately 14% of candidates did not receive the diploma
- A-level fail rate: approximately 3% of entries received a U (ungraded) result
The IB's fail rate is roughly five times higher than A-levels. This is not because IB students are less able — they are, on average, more academically selected. It is because the IB has compound failure conditions that create genuine risk.
To receive the IB Diploma, you must simultaneously:
- Score 24 or more total points
- Avoid a grade 1 in any subject
- Avoid getting an E in Theory of Knowledge or the Extended Essay
- Complete all CAS requirements
Any one of these conditions failing means no diploma, even if your subject grades are excellent. A student who scores 38 subject points but gets an E in TOK receives nothing — no diploma, no partial award, no credit for the subject grades. At A-levels, a U in one subject does not affect the other results; you can still receive two or three perfectly valid grades.
Grade distributions: how hard is it to get top grades?
A-levels (2024, England):
- A* rate across all subjects: 9.3%
- A or A* combined: 27.6%
- Significant variation by subject: A-level Mathematics had 42% achieving A or A*; Design and Technology had a much lower proportion
IB (May 2024):
- Grade 7 in any HL subject: approximately 5–8% of candidates per subject (varies by subject)
- 40 or more total points: approximately 9–11%
- Mean score: 30.3 out of 45
The top-grade comparison is imperfect because they measure different things. But IB grade 7 (awarded to roughly 5–8% per subject) appears harder to achieve than A-level A* (9.3% of entries across all subjects). This is consistent with the IB's overall reputation as a higher-ceiling qualification — but only marginally.
More telling is the mean: 30.3 out of 45 means the average IB candidate scores well below the top third of the scale. The distribution is wide.
Workload: breadth vs depth
The clearest difference between IB and A-level difficulty is the axis on which each qualification is demanding.
A-levels are hard in depth. Three subjects, each studied to approximately 360 teaching hours. A-level content is specifically designed for university preparation in that discipline — the jump from A-level Maths to university Maths is large, but A-level provides the best available preparation for it.
The IB is hard in breadth. Six subjects simultaneously, each HL at approximately 240 teaching hours, plus TOK, the Extended Essay, and CAS running alongside. The challenge is managing sustained multi-subject pressure over two years without any one subject falling behind.
Workload data:
- IB students: approximately 22 hours per week on coursework outside school
- A-level students: approximately 16–18 hours per week
The 4–6 extra hours per week compounds significantly. Over two years, that is roughly 300–400 additional hours of academic work compared to A-levels — roughly equivalent to an extra AS-level's worth of study.
Subject-by-subject: where the real difficulty differences lie
Mathematics
This is the most significant subject-level difference between the two qualifications.
A-level Mathematics: approximately 360 teaching hours. Covers algebra, calculus, statistics, mechanics, proof.
A-level Further Mathematics: a separate, additional A-level covering advanced pure maths — complex numbers, differential equations, matrices, abstract algebra, sequences and series at greater depth, and full proof-based content. Recommended (and sometimes effectively required) for Cambridge Maths, Oxford Physics, and Imperial Engineering.
IB Maths Analysis and Approaches HL: approximately 240 teaching hours. Covers calculus, algebra, functions, statistics, proofs — broadly similar to A-level Maths in scope. Does not extend to the content of A-level Further Maths.
The conclusion: IB Maths AA HL is roughly equivalent to A-level Maths in difficulty. It does not match A-level Further Maths in depth. Students targeting Cambridge Maths or other high-STEM courses need to cover Further Maths content independently if they are taking the IB.
IB Maths Applications and Interpretations HL: significantly less rigorous than AA HL. Not accepted for STEM courses at top UK universities.
Sciences (Chemistry, Biology, Physics)
IB HL science courses cover broadly similar content to A-level equivalents but with fewer teaching hours (approximately 240 vs 360). The A-level science syllabi go deeper in certain areas:
- Chemistry: A-level covers organic chemistry mechanisms, physical chemistry, and spectroscopy in greater depth. IB HL Chemistry covers the same broad topics but with some areas treated less extensively.
- Biology: Similar — A-level Biology is more comprehensive in some topic areas (e.g., genetics and immunology depth).
- Physics: A-level Physics is typically considered broader in mechanics and electricity content; IB HL Physics covers similar content but with different emphasis and less time.
In practice, university lecturers report that both A-level and IB HL students need bridging for first-year university science content. Neither qualification fully eliminates the jump.
IB HL sciences also include mandatory internal assessments (lab investigations, typically 10 hours per subject) that develop practical skills. A-level sciences have reduced practical assessment since the removal of coursework — skills are assessed through endorsement, not marks. Some university academics see the IB's continued lab-based assessment as a genuine advantage.
Humanities and Languages
For humanities subjects (History, English Literature, Geography, Economics, Languages), the difficulty comparison between IB HL and A-level is fairly even. The IB's global perspective — using texts from multiple traditions, approaching history comparatively — suits some students better; the A-level's depth in specific topics and periods suits others.
The IB's language requirement (Group 2: a second language at SL or HL) has no equivalent at A-level. For students taking a second language anyway, this is neutral. For those who are not natural linguists and would never choose a language A-level, studying a language SL for two years adds genuine difficulty.
The Extended Essay and TOK: extra burden or useful preparation?
Extended Essay
A 4,000-word independent research essay in a subject of your choice. The EE is completed in addition to six subjects and has its own deadline in Year 2 of the IB. Most students spend 40–50 hours on their EE (finding a topic, reading, drafting, editing).
By A-level standards, this is similar to an EPQ (Extended Project Qualification) — but the EPQ is optional, chosen by students who want to add it. The EE is mandatory for every IB student.
The academic value of the EE is real: students who complete a focused, well-researched essay are better prepared for university dissertations than those who have not. But the EE added on top of six subjects and TOK creates a genuine crunch point, particularly in the first semester of Year 2 when it is typically due alongside mock exams and IA completion.
Theory of Knowledge
TOK is a 100-hour course examining the nature of knowledge: how do we know what we know? It is assessed by an essay (1,600 words) and an exhibition. Students who engage with it genuinely develop critical thinking skills. Students who treat it as a checkbox find it irritating and time-consuming.
Its most important feature for practical purposes: an E grade in TOK means you fail the entire diploma. This is not a hypothetical — it happens. TOK should not be treated as a low-priority component.
University preparation: which is better?
The IBO's 2021 HESA study found that IB students were less likely to drop out of UK universities and more likely to graduate with honours than comparable A-level students. This suggests the IB prepares students at least as well — and arguably better — for the academic demands of university.
However, the same caveats apply here as everywhere: IB students in the UK tend to come from more privileged educational backgrounds, and the data was commissioned by the IBO itself.
What is more directly measurable: university lecturers frequently comment that IB students are comfortable with sustained multi-subject pressure, manage deadlines across multiple commitments, and have experience of independent research (via the EE). These are all things that distinguish university work from A-level work, and the IB has trained students in all of them.
The verdict: harder in what way?
| Dimension | IB | A-Levels |
|---|---|---|
| Total weekly workload | Higher (22 hrs/wk) | Lower (16–18 hrs/wk) |
| Per-subject depth | Lower per subject | Higher per subject |
| Fail risk | High (~14%) | Low (~3%) |
| Top grade difficulty | Roughly comparable | Roughly comparable |
| Maths depth (STEM) | Lower (no Further Maths equivalent) | Higher (Further Maths available) |
| Independent research requirement | Yes (EE mandatory) | No (EPQ optional) |
| Simultaneous subject load | 6 subjects | 3 subjects |
The IB is harder to survive without dropping something. A-levels are harder to master in depth in their chosen subjects. For students who are strong generalists, the IB's breadth challenge may come more naturally. For students who are exceptional in two or three specific subjects, A-levels allow that strength to shine without the drag of weaker subjects pulling down a holistic score.
One thing is consistent across both qualifications: whatever you are studying, the personal statement is where you demonstrate the intellectual depth and motivation that get you into competitive universities. If you want to see how yours reads, Statementory gives you detailed feedback on exactly that. Try the free preview before you submit.
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