how should i prepare for iit-jee & other entrance exams after my board exams as i have very much less time for it now?

Dear sagar

Its time for revision of whole syllabus.  you should complete your syllabus before your board exam .And after your board exam you should only revise. in that day you  can solve model papers at least one in a day . and study important concepts and revise formulas.And during solving papers in which concept you feel difficulty ,refer books or study material to remove your doubts .

 Just stay calm and focus on understanding rather than mugging.

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Regards,
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Badiuddin</sub>