i got 88.8 percentile in jee main 2020 in g eneral ews category how much rank would i expect

Total 869010 students had appeared for the Jee Main January Session. You know, its difficult to predict the actual rank. So the expected rank would be-
(100 - 88.8) * ( 869010 / 100)
i.e. almost equal to 97329.
If the number of candidates for April exam increased to 1200000 then your final rank shall be (100 - your total score) * 1200000/100.
This is your CRL Rank. We don't have any category wise ranks yet. You can Use our rank predictor-
http://engineering.careers360.com/articles/jee-main-rank-predictor