When choosing an international school, most families end up comparing two systems: the International Baccalaureate (IB) and the Cambridge International Curriculum. Both are accepted by leading universities worldwide. But beneath the surface, they reflect very different ideas about what education should look like.

The key difference: how students learn

🌍
IB — Critical thinking & analysis
  • Essay-based, open-ended questions
  • Emphasis on reasoning and explanation
  • Cross-subject connections encouraged
  • Extended Essay, Theory of Knowledge, CAS
  • Internal assessments count toward final grade
→ IB develops analytical thinking and intellectual independence
🇬🇧
Cambridge — Knowledge & exam performance
  • Structured learning, subject depth
  • Emphasis on accuracy and exam technique
  • Clear methods, predictable formats
  • IGCSEs + A-Levels as primary qualifications
  • Final exams carry most of the weight
→ Cambridge builds strong academic knowledge and exam technique

A concrete example: Mathematics

The same subject looks quite different depending on the programme. Here's how maths works in practice:

Mathematics — how it's taught
🌍 IB Maths
  • Explanation-based problems
  • Real-world application required
  • Justification and reasoning expected
  • Internal assessments count
→ Focus on understanding
🇬🇧 Cambridge Maths
  • Standard problem types
  • Clear, repeatable methods
  • Speed and accuracy trained
  • Exam format is consistent
→ Focus on correct answers

What exams exist in each system?

🌍 IB assessment

In the IB, exams are only part of the final result. The Diploma score (out of 45) includes final exams, internal assessments (coursework), the Extended Essay, and Theory of Knowledge. Results are standardised and externally moderated — which makes IB scores highly comparable across schools worldwide. Full guide to IB scores and structure →

🇬🇧 Cambridge exams

The Cambridge pathway has two main milestones: IGCSEs at age 15–16 and A-Levels at age 17–18. Exams are the primary outcome of the programme — they carry most of the academic weight, with little or no coursework in many subjects. Full guide to Cambridge curriculum and grades →

Many Cambridge schools in Portugal also offer the IB Diploma in the final two years (Years 12–13) as an alternative to A-Levels. So choosing a Cambridge school doesn't necessarily mean closing the door on IB. Browse schools by programme →

Which exams do universities accept?

Both IB and Cambridge are widely accepted by universities worldwide — including Oxford, Cambridge, MIT, and top European institutions. However, requirements vary by country, university, and subject. Some universities have minimum score requirements for specific IB subjects; others specify A-Level grades. It's worth checking the entry requirements of your target universities early.

Can you switch or mix systems?

Switching between systems
🌍 IB student → Cambridge/SAT
  • Can take SAT through approved centres
  • Can register for IGCSE or A-Level as private candidate
  • IB does not specifically prepare for these
→ Possible, but requires extra preparation
🇬🇧 Cambridge student → IB
  • Cannot take IB exams independently
  • Must complete the full IB programme
  • Requires: 6 subjects + EE + TOK + CAS + assessments
→ IB is a full programme, not just exams

Which programme is more difficult?

Dimension 🌍 IB 🇬🇧 Cambridge
Workload Higher — 6 subjects + EE + TOK + CAS More focused — 3–4 A-Level subjects
Depth Broad across subjects Deep in chosen subjects
Exams Exams + coursework + internal assessments Primarily exam-based
Flexibility Less — fixed programme structure More — choose subjects freely
Score Out of 45 points A*–E grades per subject
University recognition Excellent globally, 100+ countries Excellent, especially UK and Commonwealth

How to choose the right programme

🌍 IB may suit your child if they...
Enjoy thinking, debating, and analysing
Are comfortable with writing and essays
Are curious across many subjects
Can handle a heavier, varied workload
Are interested in universities outside the UK
🇬🇧 Cambridge may suit your child if they...
Prefer structure, clarity, and clear goals
Are strong in specific subjects they want to specialise in
Perform well under exam conditions
Want a predictable academic path
Are targeting UK universities specifically
There is no universally "better" system. The best programme is the one where your child can perform at their highest level — and where the school's teaching style matches how they learn. Visit schools, speak to current parents, and trust what you observe on the ground.