Just whatever you have done Re-revise it and give mock tests if assume mock tests are of 300 marks as JEE mains then give mock tests no matter how much syllabus you have completed. If you have not yet studied anything then first check the weightage of JEE Chapters and then watch manzil series for those chapters on JEE WALLAH channel. Then give mock tests and then lets assume in the first test you scored just 80/300, now you want atleast 200+ to be on a safer side and to book you seat in tier 2 colleges like NIT, DTU, NSUT then just give mock tests again and again at least give 100+ mock tests because mock tests are the best thing to do if you want to revise aim for increasing your marks in every mock test as we discussed earlier assume you scored 80/300 then try scorin 82 or 83 in the next mock test this will also increase your score and boost your confidence.

Well at this moment IIT is a bit difficult but yes for sure you can still crack it you surely get into top tier 2 govt. colleges!!!

BEST OF LUCK FOR THE FUTURE!!

Do let me know.. hoping to receive a good news!