I need help!

Recently I’ve been aiming for about 1-2 hrs of revision a night, 3-4 at the weekends, but I’ve found it hard to stick too. I reckon it’s because I don’t actually know what to revise and how best to actively do it, could someone give be a bit of advice. Predicted 8/9s- Geo,Maths,English lang and lit, bio,chem,physics and French. 7-music Yr 10 btw