Hello Aspirant,

As you belong to OBC then you having your reservation category/caste certificate and also the caste validity certificate. Se if you are seeking admission in IITs then you need to appear for JOSAA counselling if you will be allotted any IIT then you have to verify your documents and there caste validity certificate is necessary with caste certificate because without caste validity certificate your caste certificate is not valid. And for central caste certificate only central caste validity certificate would be considered.

For admission to IITs you need to appear for JOSAA counselling so complete process for registration for JOSAA Counselling is described below :-

Registration for the counselling on josaa.nic.in

Choice Filling and Locking of Choices.

Mock Seat Allotment

Seat Allotment Result

Payment of Seat Acceptance Fees and Download of Provisional Seat Allotment Letter

Reporting to the Reporting Centres

Confirmation of Admission

For complete details about JOSSA Counselling process kindly check out the link given below :-

https://engineering.careers360.com/articles/josaa-counselling

I hope this information helps you.