I scored L-11, R-12, S-11,W-11. Probably this is not what you want to hear, but the thing is that you can improve your score only marginally given the short time span. This doesn't mean that practice doesn't help. A 8 can easily become 10 with some good planning and practice. For instance, in the writing section, focus on coherent flow of arguments and structure it well. At the same time, keep an eye on grammar and punctuation.
Speaking is a tougher nut to crack in my opinion. My spouse who is a fluent english speaker, was able to score only 8 (which did not change even after revaluation). They ask you to explain or describe a lot of abstract concepts, which you can be good at only if you use conversational english in your daily life.