My Package is 6.40 lacs having 10 Years 10 months of experience and Currently in Level 10. Am i underpaid ??

Always calculate like this salary >= experience so If your current exp is 10.10, you salary should be atleast 10+

Depends on what skills you work on. If you’re doing operations with excel this is slightly lower . If you are consulting for a client using some enterprise finance apps like SAP, you need a double raise.

Bro you're way under paid. Just switch brother

6.4 in 10 yoe?

Yes. You should get atleast 10