You need to pass in 12th class overall, with 5 subjects, including PCM compulsorily.
In improvement, you need to make it cross 75 aggregate percentage or top 20 percentile according to 2019 data.
Improvement for one or more subject - If the candidate appears for improvement in 2020, then the top 20 percentile of 2019 will be taken into account. The maximum marks secured in the necessary subjects will be considered to calculate the aggregate percentage in such a case.
For more info, https://engineering.careers360.com/articles/jee-main-eligibility-criteria

 Also consider taking CTSE. Link: https://learn.careers360.com/careers360-talent-search-exam?icn=ctse_scholarship_lp&ici=navigation-header_ctse

Hello aspirant!  Let me to inform you that according to the rules you have to be pass in all the subjects of class 12. Without passing you are not eligible for admission to any college.  And you will have to get 75 percent marks in physics chemistry and mathematics overall to get admission.