Hello

It would be difficult to predict the exact percentile for JEE Main 2020. However, you can refer to the previous year's qualifying cutoff to have an idea about  the expected qualifying cutoff.

JEE Main 2019 qualifying cutoff is as follows-

Common Rank List (CRL)- 89.7548849
GEN-EWS- 78.2174869
Other Backward Classes (OBC-NCL)- 74.3166557
Scheduled Caste (SC)- 54.0128155
Scheduled Tribe (ST)- 44.3345172


Good Luck!