Hey there
First of all mathematics questions in entrance exams for economics is not that tough as JEE advanced so please do not go to that depth or else you will have less time for other subjects.
Books like
1. R.d Shama
2. KC Sinha.
3. Also you can solve s.l loney if time permits and g tewani cengage.
Good luck
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile