sfm old

I would suggest you to get a good reference book, A.N Sridhar is very good for clearing concepts. 

Start by picking out the most important chapters by weightage of marks.

Read the concepts thoroughly, In A.N Sridhar's book concepts are explained very well...basically read through the theory part before you attempt problems. If you directly solve problems then you'll face difficulty in exams. 

When you attempt problems, first time solve everything.

For revision follow the R&D method,those problems you feel that you should practice again mark as 'D'(Do), and those problems which you feel should just be gone through... mark it is R(revise). This will help you during revision. Also don't forget to brush up on concepts regularly.

Finally, get the updated practice manual and solve any additional problems that are not available in the reference book.

While doing that, if you find any problem that is solved differently in the PM compared to your reference book then stick to the method in the PM.

Lastly, spend an hour everyday preparing for theory questions.

All the Best!