Dear Sneha,
I would like to explain you the eligibility criteria for diploma course in taxation law.
The duration of the course is 1 year
The common eligibility criterion for a Diploma in Taxation Law is 10+2 pass out.
Also some colleges might keep the entrance examination which you need to pass.
After satisfying such conditions you'll be eligible for diploma in taxation law.

I hope this information helps you

All the best