Hello,

If you have already filled up the form for any of the session (February, March, April) and want to change category for May session then you can change your category when correction window for May session will open.

If you are filling up the form for the first time then choose OBC category and upload documents for the same. You can even make corrections one correction window will open. An option (Icon) will open on your screen, and by going through that icon you can upload your documents like Certificates, Marksheet, photos etc. But, before filling up or correcting the form it is compulsory for you to save the scanned documents in your respective device, which you are going to use to fill up JEE MAINS form (Mobile, PC or Laptop or Tablet).

If you still don't understand then, I am mentioning a link below, go through the link and you can see the clear steps to upload documents and you will see the step by step video guide too (regarding how to fill up JEE MAINS form)

https://engineering.careers360.com/articles/how-to-fill-jee-main-application-form

To see how to make corrections in JEE MAINS form, please go through this link

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-application-form-correction/amp

Application form for May session are going to release from May 3rd, 2021.

Good Luck.