For the preparation of any exam all you need is a good study material.
Here are some reference books which are easy to understand hope they will help you inPreparation.
Integral Calculus: F. Ayres (Schaum’s), Gorakh Prasad
Vector Calculus: Murray R. Spiegel (Schaum’s), A.R.Vasishtha
Linear Algebra: Seymour Lipschitz (Schaum’s), H. Anton, A.R.Vasishtha.
Ordinary Differential Equation: Peter J. Collins, G.F. Simmons, M.D. Raisinghania.
Principle of Real Analysis: S. C. Malik.
Real Analysis: H. L. Royden.
Modern Algebra: A. R. Vasishtha 8. University Algebra: N. S. Gopalakrishan.