It will be difficult to predict score from percentile as percentile only tell about relative performance of the candidates in their respective session.You can take rough idea about your rank under general category using this formula: Probable Rank={100-percentile score}×874469/100.This will gives you rank under general quota.

For assurance wait till NTA decalres rank .NTA will declares rank after 2nd phase of the jee mains exam.

GOOD LUCK!