Hello Aspirant,

See if you don't have your OBC certificate right now and unable to get it by the time so you can apply for General category in first attempt of JEE-Main and when you will get it later on before another shift of JEE-Main (as this year JEE-Main will be conducted four times in February, March, April & May), then you can change your category to OBC later on because the facility will be provided after each attempt.

You can apply for JEE-Main from the official portal of JEE-Main which is given below :-

https://jeemain.nta.nic.in/webinfo2021/Page/Page?PageId=1&LangId=P

Note that this application process will continues till January 16th 2021 and last date for payment of application fee is January 17th 2021 after which neither application nor application fee will be accepted and then after the correction window will be opened for the applicants from January 19th to January 21st 2021. Admit cards will be available for download from second week of February 2021 and the examination will be conducted from February 23rd to February 26th 2021 in two shifts per day, for February attempt.

This year JEE-Main is being conducted with slight changes in it's pattern and it's conduction and you can check out all the changes from the link given below :-

https://engineering.careers360.com/exams/jee-main

I hope this information helps you.

Good Luck!!