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You need following things
1. Atleast one or two research papers published in PhD
2. Your supervisor approves your work and thinks you have done enough progress work.
3. You need to present your work in department in front of teachers
4. Than you need to write thesis and submit it to the iisc.
5. Than they will review your thesis. They may ask you to correct somethings in thesis. Than you need to modify it and again send them for review
6. Once the thesis review is done. You need to defend your thesis in front of iisc teachers. If your review is done than defense will be passed easily. After this they will reward you Ph.D. degree.

Possibly, there's 50 - 50 chances cause no sooner does the covid cases lowers, than the offline classes will began.