Question

Can anyone tell me which chapter to strart for iit jee preparation
In maths physics and chemistry

Answer 1

vector in physics .

trigo . in math

and

structure of atom in chem .

Answer 2

you might want to throw in a couple of books and hours for the basics of physics, maths and chemistry

Go ahead with,

Dynamics, thermodynamics in physics

Mole concept, Quantum chemistry in chemistry

in maths, perhaps a revision of calculus would do