Hello Aspirant! The best way to revise for JEE Main in your last few days is through your short notes. Nothing other than the short notes you made by yourself can help you thoroughly revise the entire syllabus for JEE Main. Short notes made for every chapter, for every subject not more than a page is quite beneficial. If you've not made short notes then you haven't really prepared well and might end up scoring less marks. You can also watch YouTube videos for important or tough topics or for formulas which can help you at the last moment. Just keep on revising the concepts and formulas and that's pretty much it for scoring more than average in your JEE Main exam.
All the Best!