What this is, what it is not, and exactly what happens to anything you do here.
A free revision pack for Cambridge International AS & A Level Further Mathematics (9231), covering the two Further Pure papers — FP1 and FP2. Thirteen topics, each with worked notes, the traps examiners set, an interactive visualiser and an auto-marked quiz.
It was written against the official 2026–27 subject content, and deliberately stops where the syllabus stops. Where 9231 restricts something — eigenvalues to real and distinct cases, matrices to 3×3, polar curves to the convention, surface areas of revolution to non-polar forms — this pack restricts it too, and says so.
A revision site that is confidently wrong is worse than no revision site. So rather than asking you to trust the working, every visualiser computes its result twice — once from the closed form derived in the notes, and once independently: summing the series term by term, multiplying the matrix out, integrating numerically, substituting the solution back into the differential equation. The ✓ you see only appears when the two agree.
The worked examples and quiz answers were verified the same way. That is not a guarantee of perfection — but it means an error has to survive two independent routes to the same number.
Found a mistake? Please report it rather than working around it — a wrong result here could cost someone marks. Note the topic, the section number and what you think it should say. Corrections are the most useful thing you can contribute.
Nothing you do here leaves your device. There is no account, no login, no analytics, no cookies, no third-party scripts, and no server that could receive your data even if it wanted to. The site is a folder of static files.
Your progress is kept in your browser's localStorage under keys beginning fm-:
Two consequences worth knowing. First, progress is per-browser: your phone and your laptop keep separate streaks. Second, clearing your browser data clears your progress — so if it matters to you, export a backup from the progress panel in the top bar.
You can wipe everything at any time from that same panel, or from your browser's site-data settings. There is nothing held anywhere else to delete.
The pack needs no internet to work. Open it once, then use your browser's Install or Add to Home Screen option and it behaves like an app — all thirteen topics, every visualiser and the formula sheet keep working with no connection at all.
The maths itself is rendered as real MathML symbols baked into the page, not drawn by a script, so it stays readable even with JavaScript disabled.
This is an independent study aid. It is not affiliated with, endorsed by, or connected to Cambridge Assessment International Education, and “Cambridge International”, “9231” and “MF19” are referred to only to identify the qualification it prepares for.
Syllabuses change. Always check the current official syllabus and past papers yourself, and treat anything here that disagrees with them as an error in this pack — then tell me about it.