The Hardest IGCSEs: What Cambridge's 2026 Results Show
Which IGCSE subjects are hardest to get top grades in, based on Cambridge's June 2026 world results: subjects with the lowest A and A* rates, why some are tough, and how to prepare.
Measured by top grades, the hardest Cambridge IGCSEs in June 2026 included Geography, Business Studies, History, Mathematics, First Language English and Biology among the popular subjects. Only 25.0% of Geography candidates and 34.7% of Mathematics candidates achieved A or A\* (Cambridge International, 2026).
"Hard" can mean different things, so this guide looks at the data and explains why each subject is demanding.
Key Takeaways
- By A/A* rates, Geography, Business Studies and History were among the toughest popular IGCSEs in 2026.
- Mathematics had one of the lowest A/A* rates (34.7%) of the core subjects.
- Some subjects look hard because of who takes them, not just their content.
- The "hardest" subject for you is the one you're least strong in.
Which IGCSEs Have the Fewest Top Grades?
Among widely taken subjects, the lowest A or A\* rates in June 2026 were in Geography (25.0%), Physical Education (26.2%), English as a Second Language (26.4%), Business Studies (27.9%) and Sociology (29.9%) (Cambridge International, 2026). Smaller subjects such as Enterprise (7.6%) and Travel & Tourism (13.1%) were lower still.
| Cambridge IGCSE, June 2026 | A\* | A or A\* | C or above |
|---|---|---|---|
| Geography | 7.0% | 25.0% | 72.5% |
| Business Studies | 10.4% | 27.9% | 70.6% |
| Sociology | 8.8% | 29.9% | 74.0% |
| History | 15.3% | 33.8% | 75.6% |
| Mathematics | 18.9% | 34.7% | 72.9% |
| First Language English | 14.6% | 36.8% | 84.4% |
| Biology | 14.7% | 37.3% | 77.1% |
Source: Cambridge International, 2026.
Why Is IGCSE Maths So Hard to Score Top Grades In?
Mathematics is taken by almost every student, including many on the Core tier, which caps grades at C. That pulls down the share of top grades. The A\* boundary is also high: 162 out of 200 on the most common Extended papers in June 2026, and 177 out of 200 on another variant (Cambridge International, 2026).
Maths also has the highest ungraded rate among the core subjects: 7.1% of candidates were ungraded in June 2026. Precision across two long papers is what separates an A from an A\*.
Why Are Essay Subjects Tough?
Geography, History, Business Studies and Sociology need precise knowledge and well-structured extended writing. In these subjects, marks depend on applying knowledge to a question and evaluating, not just recalling. That's harder to master than learning facts, especially for students writing in a second language.
Our A Level command words guide explains what "explain", "assess" and "evaluate" ask for; the same skills apply at IGCSE.
Results partly reflect who takes each subject. Additional Mathematics has the highest A\* rate (26.1%) not because it's easy, but because only strong mathematicians take it. Mathematics looks harder because nearly everyone takes it. Before choosing a subject because it seems "easy" or avoiding it because it seems "hard", look at your own strengths, not the averages.
What About GCSE?
UK GCSE results show a similar pattern. Across the UK in 2026, 22% of all GCSE results were 7/A or above (JCQ, 2026), and Ofqual notes that results vary widely between subjects and regions (Ofqual, 2026). In England, London had the highest share of grade 7+ results (28.6%) and the North East the lowest (17.7%).
The IGCSE students we tutor rarely find a subject hard in general. They find specific things hard: unseen questions in Maths, long answers in Geography or History, precise definitions in Biology. Pinning down exactly where the marks go is the fastest way to improve.
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Frequently Asked Questions
What is the hardest IGCSE subject?
By top grades among popular subjects, Geography was one of the hardest in June 2026: 25.0% of candidates got A or A\* (Cambridge International, 2026). Smaller subjects such as Enterprise had even lower rates.
Is IGCSE Maths harder than GCSE Maths?
The standards are comparable; Cambridge aligns IGCSE standards with GCSE in England (Cambridge International, 2026). The content and question styles differ, and IGCSE Extended Maths includes some topics beyond GCSE.
Which IGCSE science is hardest?
By top grades, Biology: 37.3% of candidates got A or A\* in June 2026, against 44.1% in Chemistry and 44.5% in Physics (Cambridge International, 2026). Biology's challenge is the volume of content and precise terminology.
The Bottom Line
- Geography, Business Studies, History and Maths were among the toughest popular IGCSEs in 2026.
- Maths has a high A* boundary and many Core-tier candidates.
- Essay subjects demand structured writing and evaluation.
- Results reflect who takes a subject, so judge by your own strengths.
Next, see the easiest IGCSEs based on the same data.
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