The best way to prepare right now and make your concepts strong, is to take up mock tests/solve past papers without seeing the solution. Once you do so, check how much you scored. Thereafter, stress on the questions which could not solve, see the solution and try to understand the concept, if it is something too complicated or typical, make a note of same in a separtae notebook, keep this doing atleatse for next 10 days. Make sure you solve and do the post analysis for atleast two such papers each day. 

At the tenth day you will realise you have a list of typical stuffs/ specific concepts you are week in, keep brushing up these for next 5 days, you will be great to go for your exams.