Two main post-16 routes after IGCSE: three or four A-Levels (depth) or the IB Diploma (breadth + core). Here is how to choose for your child.
Velocity Tuition Academy · Post-16 · Decision Guide
Updated May 2026·Written by Velocity Tuition Academy·Reviewed by experienced A-Level and IB Diploma teachers
You've completed IGCSE. What comes next? For students in international schools and many UK independent schools, the choice is between A-Levels (typically three or four subjects in depth) and the IB Diploma (six subjects plus TOK, EE and CAS). Both are widely accepted by universities worldwide; both lead to undergraduate admission. But they are very different programmes, and the right choice depends on the specific student.
For most international families the two main post-16 routes are:
A-Levels (Cambridge or Edexcel) — typically three or four subjects studied in depth across Years 12-13. Graded A*-E. Standard UK route, well-recognised internationally.
IB Diploma — six subjects (three HL, three SL) plus the core (TOK, EE, CAS). Scored out of 45 points. Strong international recognition, particularly for US and breadth-valuing applications.
Less common alternatives that exist:
BTEC — vocational qualifications, less common for university-route international students.
US High School Diploma + AP courses — for students attending US-curriculum schools.
National-curriculum alternatives in the student's home country (French Baccalauréat, German Abitur, etc.).
IB Career-Related Programme (CP) — IB's vocational alternative to the Diploma.
This guide focuses on the IB Diploma vs A-Levels decision, which covers most international families.
Match To Your Strongest IGCSE Profile
What does your IGCSE record tell you?
Strong across 8+ subjects with 6+/B+: the IB Diploma's breadth suits this profile. The student has demonstrated they can perform across many subjects; the IB rewards that.
Outstanding in 3-4 specific subjects, weaker in others: A-Levels let the student go deep in the strengths and drop the weaknesses.
Strong Sciences and Maths, weaker Languages/Arts: A-Levels (Maths, Physics, Chemistry + optional Further Maths) usually produce a stronger STEM application than the IB.
Strong Languages, Humanities, and the sciences too: the IB Diploma's mandatory Language Acquisition and breadth fit this profile particularly well.
Match To Target Universities
Oxbridge, Russell Group, Imperial: both routes accepted. A-Levels are the traditional path with deeper subject preparation for competitive STEM courses. The IB is read equally; specific HL grades matter.
US universities (Ivy League, top liberal arts): the IB Diploma has an edge for breadth and the Extended Essay as a research credential. A-Levels also accepted but require SAT/ACT supplements.
Canadian U15 universities (UToronto, McGill, UBC): both accepted equally. Published equivalences for each.
Australian Group of Eight: both accepted. ATAR equivalence calculations published.
Mixed international applications: IB Diploma hedges geography better.
Workload Reality
One of the biggest practical differences is weekly workload:
A-Levels (three subjects): typically 18-25 hours of academic work per week, depending on the subjects.
A-Levels (four subjects): 25-32 hours per week.
IB Diploma: typically 30-38 hours per week including subjects, TOK, EE, CAS — equivalent to a full second job on top of school hours.
For workload-sensitive students this matters. A student who would produce an A*A*A across three A-Levels but 32 points across the IB Diploma will get a stronger university outcome from the A-Levels. For students who manage workload comfortably, the IB's breadth signal is genuinely valuable.
Transition Practicalities
The IGCSE-to-Year-12 transition has specifics to manage:
IGCSE-to-A-Level continuity: straightforward. A-Levels build on IGCSE foundations in each subject. Cambridge IGCSE Extended → Cambridge A-Level is the smoothest path; Edexcel-to-Edexcel similar. Cross-board transitions (Edexcel IGCSE → Cambridge A-Level, or vice versa) need minor syllabus bridging.
IGCSE-to-IB-Diploma transition: needs more bridging. The IB Diploma assumes preparation slightly different from IGCSE, particularly in Maths and Sciences. Most IB schools provide a bridging period in IB Year 1; some schools require a 4-6 week summer programme.
Subject availability: A-Levels offer a wider menu of specific subjects. The IB requires one subject from each of six groups, which constrains some specialisations.
School transitions: if changing schools at age 16, both routes are available at most international schools. UK independent schools split: most offer A-Levels, some offer both, fewer offer only the IB.
Honest Decision Framework
Three questions, answered honestly:
What is your child genuinely good at across the IGCSE subjects? Wide strengths → IB. Concentrated strengths → A-Levels.
Where are they applying to university? Specifically — which countries, which institutions, which courses? Work backward from requirements.
What workload does your child sustain? If 30-38 hours a week of academic work is genuinely feasible, the IB is sustainable. If not, three A-Levels done well beats six IB subjects done at moderate scores.
There is no wrong answer. There is the right answer for this specific student.
Planning the post-IGCSE step?
Our 1-on-1 tutors cover both routes — Cambridge and Edexcel A-Levels, plus IB Diploma HL and SL across all subjects. Free diagnostic trial assesses the student's strengths and recommends the right path with honest reasoning.
For most international families, the choice is between A-Levels (three or four subjects in depth) and the IB Diploma (six subjects plus TOK, EE, CAS). Less common alternatives include BTEC, the US High School Diploma + AP, national-curriculum equivalents, and the IB Career-Related Programme. Both A-Levels and IB Diploma are widely accepted by universities worldwide.
Depends on the student. A-Levels suit students with concentrated subject strengths (especially STEM-focused), those who prefer depth over breadth, and those targeting competitive UK STEM. The IB Diploma suits students strong across many subjects, those targeting US universities or international applications, and those who thrive on breadth and reflection. Workload tolerance also matters — the IB is heavier.
A-Levels — slightly. IGCSE-to-A-Level continuity is straightforward because A-Levels build directly on IGCSE foundations, especially in the same board (Cambridge → Cambridge). IGCSE-to-IB-Diploma requires more bridging because IB Diploma HL assumes preparation slightly different from IGCSE in Maths and Sciences. Most schools accommodate the bridging in the first IB Diploma term.
Three is the standard for most students. Four is appropriate for students aiming at the most competitive courses (Cambridge, Imperial, Oxford) where Further Maths is expected or where a fourth subject strengthens a specific application (e.g., a language for Modern Languages). Five A-Levels is rare and usually counterproductive — better to do three or four well than five averagely.
Possible but rarely advisable mid-Diploma. Switching at the end of IB Year 1 is feasible if the student starts A-Level Year 12 fresh. Switching mid-IB-Year-2 is generally not advised because the partial Diploma credit doesn't transfer cleanly. Most schools recommend completing the IB if the student is past the halfway point.
The IB Diploma keeps the most doors open because it requires six subjects across the disciplines. A student undecided between STEM and Humanities loses fewer options on the IB than on three A-Levels. That said, three A-Levels with strong Sciences and Maths also keeps most STEM and many non-STEM doors open. The worst choice is early over-specialisation without strong conviction.
