Hey Raghav

Yes all the IITs and  NITs and IITs offer EWS reservation.  In order to avail this benefit, you need to get your EWS done.

For getting an EWS certificate, take following documents,

• Aadhaar Card (mandatory)
• Income Certificate (mandatory)Pan Card (mandatory)
• Caste Certificate
• BPL Card
• Bank Statement
•  Recent Passport size photos

Then you can contact your Local Govt. Authority (Tehsil). However, it may take a lot of time. You can contact an Agent in Jan Sewa Kendra (CSC) nearby your location. In this way, your work will be done faster, because of their good link in Tehsil.

Hope it helps

All the best!