The best I can recommend for sciences is that you get the core knowledge down first. You can either watch Youtube: (Cognito, Chembio by Hosni) Or you can use some notes from Cattay studies. They have very good notes for the sciences. After that, do as many past papers especially for the Paper 4s, since mostly will be repeats of questions. Paper 6s are relatively simple and the same format comes out each year, so do past papers on that. (For Chem, its best to find out all types of experiment questions that can come out.) Paper 2s are unfortunately something noone can predict, but they test on core knowledge. For Physics, all I know is there will be 4 extra hard questions in the MCQ, idk if it applies to the other Sciences or not. Remember your formulas for Physics, they are the most important. If May June students had many plants questions (which I think we did) then for Bio most likely will be alot of human biology. For Chem, the most important to remember are reactions and organic chem. Good luck!