Dear Rohit ,

I would like to say first of all start from the basic like 11 and 12th standard NCERT books there you can easily know the basic concept then go for the previous year questions papers with solution there you will understand the pattern and what types of question will arises exam .then after solving question papers from easier to harder level because you will get more confident at the time of solving questions .Then weekly basis give mock test where you will get your standard  and  those concepts are you feel is harder for you more focus on this area.
In this way and easily you can cover your syllabus smartly with good sore .

I hope it will helpful

Thanks