First I would suggest you to clear the basics my completing your 12 th portion. 

If you have already done it then well and good. 

There are many good books available in the market  I would suggest you to have a clarity of concepts from NCERT books and HC Verma for physics. If you are done with it then you can solve questions from Arihant,Vidyabharti .

At the end of the day what matters is how much you know and how much you have practiced. So solve as many books as you can and also solve past years papers. 

If you still have any queries feel free to ask in the comment section down below.