How can I pass JEE without any coaching?

You can collect all the previous year's questions. You should clear your concepts as well as rigid. You should practice as much as you can. Knowing the theory and formulae, won't help you. Best of luck.

You need to keep your basic concepts clear. You should study from NCERT books for strengthening the basic concepts. Try as much application based problems as possible. You need to sit for 3 hours and in order to solve these problems. Try and solve all the previous years question papers.