The two books which I know that can help you in clearing ISI entrance exam are:

(1). Test of mathematics at 10 + 2 Level

(2). Challenges and thrill of Pre- College Mathematics

However the ISI entrance exam is knowledge based and is Subjective (Paper 2). You are advised to learn concepts and not a particular question.

Best of luck for your exam.

hi,

see isi is one of the prestigious institute for pursuing b.state course. if you are a mathematics lover this is the best place for you. during form filling it need to mention that whether you are applying for b.state or b.math, however cutoff marks for b.state is lower than b.math. however you may find some difficulty if you have not statistics in 10+2 course. you need to buy a book which is test of mathematics of 10+2 level , this books is generally called TOMATO, which published by isi. here you may get the details idea of what type of questions asked in isi in b.state entrance test. give most importance in probability, set theory, number theory, combinatorics for b.state entrance preparation.