As you want to get the list of some of the best reference books for the Indian Statistical Institute M.Math Entrance Test so here is the information of the same for you:

Reference books for Algebra
• Abstract Algebra by Bhattacharya, Jain & Nagpal
• Complex numbers from A to Z, by T.Andreescu, D.Andrica
• Elementary Linear Algebra by Chatles W.Curtis
• Elementary Linear Algebra by H.Anton
• Linear Algebra and its Applications by David C. Lay

Reference books for Differential Equations
• Differential Equations by G.F.Simmons
• Advanced Engineering Mathematics by Wylie, C.R. and Burrett, L.C
• Differential equations and their applications by Ahsan,Z
• Differential equations and the calculus of variations by Yankosky
• Partial differential equations – methods and applications by Mcowan, R.C
• Differential and integral equations by Collins, P.J

Reference books for Real Analysis
• Methods of Real Analysis by Richard.R Goldberg
• Mathematical Analysis by Binmore K.G
• Mathematical Analysis by Apostol T.M
• Introduction to Real Analysis by R. G. Bartle and D. R. Sherbert
• Fundamentals of Real Analysis by V.K Krishnan
• Elementary analysis: the theory of calculus by K. A. Ross
• A course of Mathematical Analysis by Shanti Narayan
• Real Analysis by H.L. Royden
• Principles of Mathematical Analysis by Rudin .W

Reference books for Calculus
• Integral Calculus by Gorakh Prasad
• Calculus by Pisknov
• Calculus by H. Anton, I. Bivens and S. Davis
• Calculus by M. J. Strauss, G. L. Bradley and K. J. Smith
• Differential Calculus by Gorakh Prasad
• A text –Book of Vector Calculus by Shanti Narayan

Reference books for Probability and Statistics
• Set Theory by Thomas J. Jech
• Basic Mathematics by Serge A. Lang
• Data Interpretation and Logical reasoning’ by Arun Sharma
• Mathematics All Around by Thomas L. Pirnot
• Matrices and Linear Transformations by Charles G. Cullen
• Analytic Geometry by Douglas F. Riddle
• Introduction to Probability Models by Ross, S. M
• Statistics by Murray & Spiegel
• Mathematical Statistics by Ray & Sharma