Hii

Please be informed that for IITs, the scores of JEE Mains are not used instead you require to qualify JEE Advance.
For being eligible to appear in JEE Advance, you need to clear the cutoffs in JEE Mains and secure your position in top 224000 students or simple top 80 percentiles.
After appearing for jee advance and qualifying with required cutoffs, you will be given admission to IITs.
To know more about IIT Admissions and JEE Advance use the following links
https://engineering.careers360.com/articles/jee-advanced
https://engineering.careers360.com/exams/jee-advanced
https://engineering.careers360.com/tags/iit-admission

hope this helps
Thanks!!

Through mains score you can't take admission in IITs .Thr Through this score you can only take admission in NITs,IIITs and CFTIs.88.511 is good percentile in ST quota.U can take rough idea about your rank under general quota as percentile score is common to all.You can use this formula:Probable Rank = (100- NTA percentile score ) X 874469 /100.

You will get lot of NITs under ST quota under this percentile score.For assurance wait till NTA decalres raw score and cuttoff score.NTA will declares rank and score after 2nd phase of jee mains.

GOOD LUCK!