Hi Deepak,

You are not eligible for this exam if you are pursuing BSc (3 year degree) with the exception BSc in Research/BS are eligible. There is a revised criteria for GATE 2021 if you are pursuing BSc in research (4 year degree) and currently in 3rd year or in higher grade or completed then you are eligible. You can check here the details of eligibility

https://engineering.careers360.com/articles/gate-eligibility-criteria