Dude, trust on books. Most of the jee crackers dont use correspondence courses but books. Get the best books for each subject. However if u want an indepth learning of each topic, cover that topic first from a book n then ur correspondence study material.
I am only one,
But still I am one.
I cannot do everything,
But still I can do something;
And because I cannot do everything
I will not refuse to do the something that I can do.
- Edward Everett Hale