Is Khan Academy Enough for IGCSE and A-Level?
Khan Academy is free and genuinely good — but it isn't built for Cambridge, Edexcel or IB mark schemes. Where it works, where it doesn't, and what to add.
Founder of gettopmarks. Sat the same exams these guides cover, and built the product after finding that generic AI tools could answer a question without ever explaining what the mark scheme wanted.
If you're revising for IGCSE, A-Level or IB and someone has told you to "just use Khan Academy", it's worth understanding what you're getting — and what you aren't. Khan Academy is one of the best free education resources ever built. It is also not built for your exam.
That distinction matters more than it sounds, and it's the reason students can spend months on free videos and still walk into a Cambridge paper underprepared.
What Khan Academy genuinely does well
Let's be fair, because it earns it:
- It's free. No trial, no subscription, no upsell. For a lot of families that settles the question, and reasonably so.
- The maths explanations are excellent. For understanding why a method works — algebra, trigonometry, calculus foundations — the videos are clear, patient, and well sequenced.
- The practice engine adapts. It tracks what you get wrong and serves more of it, which is real spaced practice rather than passive watching.
- It fills genuine gaps. If a topic never landed in Year 9 and it's now blocking A-Level work, Khan Academy is often the fastest way to repair it.
If your problem is "I don't understand this concept at all", Khan Academy is a very good answer, and you should use it.
Where it stops being enough
Khan Academy's content is built primarily around the US curriculum — Common Core maths, AP courses, SAT preparation. That's not a criticism; it's who it was built for. But it creates four specific gaps for international exam students.
1. It isn't aligned to your syllabus
Cambridge IGCSE Maths 0580 and Edexcel International GCSE 4MA1 have defined content lists, and your paper only tests what's on them. Khan Academy doesn't map to either. You end up studying topics you'll never be examined on, while missing ones you will be.
Worse, the depth is calibrated differently. Some topics go far beyond what your paper needs; others stop short of it.
2. It doesn't teach mark schemes
This is the big one. Your grade isn't awarded for understanding — it's awarded for writing what the mark scheme credits.
Khan Academy teaches you to get the right answer. It does not teach you that a 4-mark "explain" question needs four linked reasons, that method marks survive a wrong final answer, or that "describe" and "explain" are different instructions. Those conventions are where most marks are actually lost. Our guide to command words covers the vocabulary Khan Academy has no reason to teach.
3. No exam-board practice material
There's no Cambridge or Edexcel past paper practice, no examiner reports, no mark schemes. And past papers are the single highest-return revision activity available to you — the past papers method matters more in the final six weeks than any amount of new content.
4. It can't work from your own material
Your teacher's notes, your class slides, the specific chapter your school is examining next week — Khan Academy has no way to use any of it. Everything is generic by design.
Honest comparison
| Khan Academy | An exam-aligned study tool | |
|---|---|---|
| Cost | Free | Paid subscription |
| Concept explanation | Excellent | Good |
| Syllabus alignment | US curriculum | Cambridge, Edexcel, IB |
| Mark-scheme language | Not covered | Core feature |
| Past paper technique | Not covered | Core feature |
| Works from your notes | No | Yes |
| Command word training | No | Yes |
| Best for | Understanding a concept | Converting understanding into marks |
Read that table honestly: there's a column where Khan Academy wins outright, and it's an important one.
What about Khanmigo?
Khanmigo is Khan Academy's AI tutor, and it's a genuinely good implementation of the Socratic approach — it pushes you to reason rather than handing over answers. That's the right instinct, and it's the same instinct behind a guided tutor style.
The limitation is the same as above: it's tutoring against Khan Academy's curriculum, not against your syllabus and mark scheme. A strong AI tutor that doesn't know what Cambridge rewards will still leave marks on the table.
The practical answer: use both
The framing of "free versus paid" is usually the wrong one. These tools do different jobs.
Use Khan Academy when:
- A concept genuinely hasn't clicked and you need it explained from scratch
- You have a foundational gap from an earlier year blocking current work
- You want extra drill on mechanical maths skills
- Your budget is zero — in which case use it properly and pair it with free past papers from your board
You need something exam-specific when:
- You understand the content but keep losing marks
- You need to know the exact phrasing that earns credit
- You're revising from your own notes and class materials
- You're inside the final two months and technique is now the constraint
If you understand the topic and still lost marks, more explanation won't fix it. That's a mark-scheme problem, not a knowledge problem.
How to tell which problem you have
Take a past paper question you got wrong and ask one question: did I not know it, or did I know it and write it badly?
- Didn't know it — content gap. Khan Academy, your textbook, or your teacher.
- Knew it, wrote it badly — technique gap. No amount of watching videos will move this.
Most students who plateau at a 6 have the second problem and keep treating it like the first. That's why they plateau. Our week-by-week IGCSE revision plan splits revision into exactly these two phases so you don't spend the final month on the wrong one.
Where gettopmarks fits
We're not trying to replace Khan Academy — genuinely, keep using it for concepts. What we do is the part it isn't built for:
- Solve works through your actual exam questions in mark-scheme language, showing where the method marks sit and why.
- The AI tutor teaches in four switchable styles, grounded in Cambridge, Edexcel and IB phrasing rather than generic explanation.
- Study sets build flashcards, MCQs and practice tests from your notes and slides — the material your exam is actually drawn from.
If free is working for you, keep going. If you understand the content and your marks still aren't moving, the gap isn't knowledge. Start a free trial and take one question you got wrong to find out which problem you actually have.