Hello Rajeevi, as you know you have very little time left for the exam so you should start solving the questions directly instead of covering the basics now. I would suggest you to go through the previous papers and analyse which kind of questions are repeated every year and study accordingly.  But of course we know that we can't totally rely on that so you just try and solve questions of every concept in maths that covers your marks in paper. This way you'd be able to get gair score. 

All the very best!

for your case I must tell you that you should start solving the question instead of going through all the basics because you don't have a lot of times so while solving the questions if you are not able to solve it then why looking the solution you should try to guess the concept and try that next time if you see a similar problem you should be able to solve it because it's the first time itself you should try to understand the concept of early so that you don't need to waste time at later stages or if you think that you can cover the basic within few days then you can go for it but not recommended