A-Level or IB? That question sounds straightforward. The answer, as with most worthwhile questions, is less straightforward.
Parents seeking guidance on this decision face a particular problem. Most of the people they ask have a vested interest. Schools advocate for what they offer. Alumni defend what they chose. Having spent 26 years as a senior examiner and paper author across both systems, I want to offer something more useful: an impartial account of what these programmes actually do, and the qualities they develop in students.
In 2023, researchers from the University of Oxford published a peer-reviewed study comparing IB Diploma students with students following national programmes in Australia, England and Norway. Their finding was striking: IB students scored significantly higher on critical thinking measures, even after controlling for prior academic achievement and socioeconomic background. Something about the programme itself appeared to develop critical thinking. It is a compelling finding, but one that requires scrutiny.
IB students tend to self-select. They come from families with higher educational expectations and greater access to support. In virtually every study, IB populations disproportionately reflect higher socioeconomic status, the single strongest predictor of academic success. Robust research attempts to control this. It cannot eliminate it entirely. That said, two elements of the IB programme do lend themselves to developing critical thinking, and they are worth naming.
Theory of Knowledge asks students not just what they know but how they know it. The Extended Essay requires every student to sustain an independent argument across 4,000 words. University tutors consistently cite both as features that distinguish IB applicants in their first year. A-Level students have their own answer. The Extended Project Qualification covers comparable ground: 5,000 words of independent research, recognised by Russell Group universities as evidence of precisely the thinking the Oxford study measured. The critical thinking gap, where it exists, is closable.
IB is a broader programme than A-Level, with six subjects across six discipline groups, so that every student engages with languages, science, humanities and mathematics, with the arts available as an option. What makes it genuinely distinctive is not the range of subjects alone but the connections that such breadth makes possible. A student who recognises a concept operating differently across physics, economics and sociology is developing something that depth alone cannot produce.
That depth, however, is what A-Level is designed for. Where IB distributes, A-Level concentrates. A typical A-Level involves approximately 360 guided hours per subject, compared with 240 at IB Higher Level and 150 at IB Standard Level. By the end of two years, a strong A-Level chemistry student has covered material that would not look out of place in a first-year university course. For students heading to Russell Group institutions in STEM, medicine or law, that depth is not incidental; it is precisely the point.
Then there is the IB Career-related Programme, the most consistently misunderstood of the three. It is not a lighter diploma. A Career-related Programme (CP) student studying Business alongside Digital Society and Mathematics might spend part of their two years in a real internship, build a business plan, develop a website using AI before turning to the Reflective Project to ask what the ethical limits of that business actually are. At Epsom, that integration is not theoretical. CP students have direct access to partnerships with AirAsia, the Ormond Group and our on-site sports academies.
Neither student is choosing an easier path. They are choosing different ones. The right programme is determined by who the learner is, how they think and where they are headed.
At Epsom, A-Level remains our core academic pathway, and we are adding IB CP for a small number of students whose profile and ambitions make it the stronger fit. For our A-Level students, we are running a Theory of Knowledge programme designed to develop the same critical thinking the Oxford research identified, built around the strategic and ethical use of AI.
Which of the three programmes is better? The one that matches the learner. And that is the only answer worth giving.
Dr Terence McAdams
Chief Education Officer