Hey there

Seeing your percentile you seem to be a bright student and thus i am assuming that you must have completed your syllabus. Just follow some steps like

1. Do not loose concentration in the remaining 22 days.

2. Solve previous year Jee advanced problems and Mocks are really important.

3. JEE does not expect 100% marks so don't get depressed if you stuck at a problem but always try to finish a selected problem on the same day.

4. Do not try new ways of study now as it will definitely hamper your studies

check the link

https://engineering.careers360.com/articles/how-prepare-for-jee-main

good luck