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 ;)