Sakthi,

Getting admission is a two-step.          process. One needs to qualify the JEE (Main) exam and then take the JEE (Advanced) exam.

• One must have secured at least 75% marks (65% for SC/ST/PwD) in Class XII OR One must be within the category-wise top 20 percentile in his/her respective Class XII board examination.
• Admissions are done on the basis of rank in JEE (Advanced) through JoSAA Counselling .

There is 10% seat in only EWS quota.

Tgere are several quita for admission General( Gender -neutral,  female only),  OBC, SC, ST, EWS quota.

This is for the first time ews qouta has been introduced.

You had to fill the form for EWS from 11-15 March.  At time of taking JEE advanced or at time of admission you need to submit EWS form.  In order to prove you are eligible for that quota.