Integral calculus -Most of the questions are from definite integral. I referred Integral Calculus by Samvedna publications .
Differential calculus - Concentrate on Rolles theorem,Lagrange’s theorem, and Intermediate value theorem. Also focus on partial differentiation. I referred Differential equations by Samvedna publications .
Vector algebra - Concentrate on Stokes’ theorem, Divergence theorem and Greens’ theorem. Questions are asked from these topics only. I referred Vector calculus by Samvedna publications.
Differential calculus - This is the easiest topic. Only ordinary differential equations is in the syllabus. I referred Differential calculus by Samvedna publications.
Linear algebra -Questions are mostly application oriented.You can either refer Linear algebra by Hoffman and Kunze (which gives a strong theoretical foundation but lacks examples and exercises for practice) or Linear algebra by Gilbert Strang( which is more application oriented and has a lot of exercises for practice).If your sole aim is to crack JAM go for the latter. But if you also want to build a strong foundation,go for the first one.