Mathematics by R.D Sharma is a very good book to prepare from.

You can also refer other books for Mathematics. Is it enough or not? Well how much ever mathematics practiced is less. Mathematics is very vast field and the more question you solve the more knowledge you will get and the more knowledge you get it's advantageous for you only. 

• Other Mathematics books which can be referred are :-  Higher Algebra by Hall and Knight, Problems in Calculus of One Variable by I.A Maron , Co-ordinate Geometry by S.L Loney, Trigonometry by S.L Loney.

Make notes of mathematics,  solve as many sums as you can. Also make separate notes of formulas. Before exam the formulas from these notes can be revised. 

Also highlight the sums which are tricky and revise them. Solve past year papers of the entrance exams because it will help you to know what types of question come in exam. 

Give mock tests and note where are silly mistakes happening so that you can avoid it in the entrance exam. 

Also pay heed to the time. The more faster you solve the questions the more time you will get for the difficult ones. 

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