My partner is not on the spectrum, but did the IB (ended up getting 34, and I don't understand why because he did no work). I can only provide anecdotal evidence, which I apologise for, but apparently sometimes people want 'stories' and not objective truth.
I don't know how your school did the mocks, but for my partner they were at the end of the first year. Was it the same for you? Did you do okay in the mocks? Because if you did, you'll definitely be fine.
My partner did English HL, German HL (it wasn't until the exam that he realised he was the only non-native speaker taking German at higher), Psychology HL, Biology SL, Art SL, Maths studies.
I remember the week before the exams, and they only thing he revised at all was Psychology (he made me help him, and a lot of it has stuck in my head). He ended up getting English 6, German 6, Psychology 6, Biology 6, Art 5, Maths Studies 4, and he got some points from his TOK essay, and his English extended essay.
Conversely his friend ended up getting 25 points, and she revised very, very hard for all her subjects.
I guess what I'm saying is, revising isn't the most important factor in achieving in exams, so worry a little less about what you're revising if you can. If you feel you're revising the most important thing, and you generally have okay judgement, then that's enough.
Good luck for your exams!