Dear Sachin, you haven't mentioned your Category. Neverthless, to be eligible for JEE Mains, you should have completed your 10+2 with Physics, Chemistry and Mathematics as your subjects. There is no minimum aggregate rule. However, to be eligible for IITs, NITs and GFTIs, you need to secure a minimum aggregate of 75% in Class 12 or you should have been in the top 20 percentile of your class. It is 75% for General Category and 65% for SC/ST Categories. So with 48.4.5 you are eligible for JEE Mains but cannot take admission to NITs, IITs, and GFTIs. For this you may have to appear for improvement exams. For more information, please visit our page at: https://engineering.careers360.com/articles/jee-main-eligibility-criteria