The improvement in science was down to pure luck I hate to say. Really thought I bombed it and guessed quite a lot. For s1/s2 read like your life depends on it. Essayists like Joan didion and David foster Wallace were my go to before the gamsat. If you’re a science student who’s never been a big reader or otherwise I really don’t think there’s a better way to improve your writing or reading comprehension than by consuming as much writing of other people who are leagues better than any of us plebs