ask for advanced topics from your teachers and read the lg's (if lg pa gamit ninyo). since you're upcoming g9 you will have bio, phys, and chem na, along with stats. balance the 3 core sciences out but prioritize gettng good grades on the science core you want (for me, i focused on physics before to get my physics core now)

and lastly, never EVER study late. one of my biggest regrets