Yes, if you belong to the OBC category it is necessary to provide the IIT JEE, if don’t come under the OBC or other reserve category then it is not mandatory.

Following documents are also required:

Class X certificate and mark sheet (Original and one attested copy)
Class XII certificate and mark sheet (Original and one attested copy)
Proof of date of birth (if not mentioned in the Class X certificate)
Caste certificate wherever applicable.
JEE Branch and Institute allotment letter
JEE 2013 Admit Card
10 Passport size photographs
5 stamp size photographs
Receipt of the payment with JEE and Hostel Fee Challan
Challan receipt of hostel/mess payment