Which precalculus course?

Hi Miri Jane, Here's how Math courses on Khan Academy work: Get Ready for X is a prep course that trains you in all the pre-requisite material for X. So there's Get Ready for Precalculus for Precalculus, Get Ready for 7th grade US Math for 7th grade US Math and so on.

In your case, I'd suggest giving the course challenge of either Get Ready for Precalc or the main Precalculus course a try - or skim through the units and see the contents, and decide if it matches your GCSE requirements.

Khan Academy also has Calculus 1 and 2, and AP Calculus AB and BC. The names can be a bit confusing, but Calc 1 and AB are roughly equivalent, as are Calc 2 and BC. The main difference is that the AP courses are strictly mapped to College Board's AP exam requirements.

Feel free to look at these Calculus courses in case they're relevant, and yes, there's a Get Ready for AP Calculus course too. Keep your GCSE syllabus handy, and find the course(s) most relevant to your curriculum. Good luck!