Hi,

Since you are currently pursuing BTech from IIT, You won't be eligible to get seats in IIT again on the basis of JEE Advanced 2021. However you can get admission into NITs of your choice. Since you had good rank in JEE Mains, you could easily get top NITs. I hope this will solve you query.

To know which Branch you can get into, you should use this tool : JEE Mains 2021 College Predictor

Thanks!!!