HI Ganesh, 

students take about a year in advance sometimes more to study and prepare for JEE MAIN

Its not easy to study and prepare thoroughly in just 2 months

but you should get your basics  clear and study NCERT books well

check all previous year papers and know more about the pattern and types of question

the colleges you want better check their cut offs and aim for the same

Attend mock test classes of TIME institute and solve mock papers as well

All the best to you