Good to see that you are willing to to appear for GRE.
Here is a list of centers that provide GRE coaching:
- Jamboree Education (P) Ltd
- Manya – The Princeton Review, Kolkata (Everest House)
- English Centre (IELTS, TOEFL, PTE, GRE)
- Manya-The Princeton Review, Kolkata (Salt Lake)
Hope this list helps.