Hello,

For now you have so much less time. So you can go for topics which you feel easy. This doesn't mean that you won't cover maths which is difficult. No, don't do like this. start form easy chapters and solve numericals. Meanwhile solve previous year papers too and get your score. try to understand concepts from your friends,teachers, from youtube or from anyone you feel that he/she can explain you. same goes for numericals too. Ask your doubts and understand the steps. if you don't steps then you won't be able to solve by yourself.

Don't try to cover all. You can't do it with 100% and forget everything.  Start from one topic and learn it. Why it happened like this and why it took this step or process. apply it to all the concepts. ask why it happen and remember it. If it is difficult then draw them in a paper and label as per the process and remember the diagram. It will be easy.

You will get tired for sure so take 10-15 min break and start again. Don't stress too much. On the part of important topics there is nothing like that. they can ask questions from anywhere. No one knows how many question will come from different topics and it has no relation from previous year paper.

You can just know how questions are asked by solving previous year papers and it will help you get some confidence. That is the only objective.

Hope it helps!