Dear Omprakash,
 
If u are planning to start ur perparation now then u must follow a  strict schedule, and u have to make the schedule  urself. I can't tell u how much time u wil need to complete a chapter but all I can tell u is that don't hurry up to complete the syllabus...its all about quality reading , make sure ur basics are clear n then only u move to next chapter like in physics u wil find that ques are interlinked and concepts from 2-3 chapters are required to solve a single prob..  In  general, an aspirant starts with basic books to build basics/concepts  like ncert books. Then read and work out books meant for jee like hc  verma, a das gupta, p bahadur etc. and after that to give a final touch  work out as many probs as u can from study material of diff.. reputed  coaching centres for jee.
 
Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.
All the best.
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Anil Pannikar
IIT Bombay