It's not possible to predict what exactly will come up for us in science because science has a LOT of topics. Sorry, not wanting to stress you out. But I would start off by learning off a few questions that came up from each of the topics that CAME UP EVERY YEAR so far. Maybe take a look in the contents of your exam papers and literally even go through all these topics and the questions from them: Acids/Bases, Atmosphere, Work/Power/Energy, Heat, Light and Uses and Effects of Electricity.
Note: all these came up EVERY YEAR. 😊👍
Wish you the best of luck!
Bonding will probably come up, Metals is nearly definite, Force and Moments is also likely, Energy, Refraction of Light
Just listing off some things I wrote down in my copy that would most likely come up after looking through past papers and noticing these things come up every year and might skip an odd year ;)