idk what to revise

i have so much regret from gcses and want my alevel results to stand out, but idk what to do, especially this early in the year. i went on pmt to do topic questions but we haven't done much, i made flashcards and got the shit we've done memorised, but what do?

i do chem bio and maths so if there's any websites or youtubers for them it'll be very appreciated.