I understand you want to do well in your SC, so, for science, I just basically went over past papers and saw that they always have a certain type of question. Eg. about technology. See if you can see a pattern and study for those. I also wrote notes, but it depends on what type of learner you are. But, just do past papers and you should see a pattern. If I don't know the answer in multiple choice, I usually do the elimination method. And if it says, eg. "best describes" try to see which one "best describes" in general terms.
Hope that helps! Good luck!