Hello aspirant,

As per the notification released by the NTA regarding economical weaker section quota (EWS)  only general candidate(whose family income below 8 lpa) are able to get benefits during the seat allocation by Jossa counseling. This means that students belonging to the EWS category will have 10% of the total seats alloted to general category students reserved for them. They will benefit as they will be able to compete for both the general category seats as well as the EWS category seats where the competition will be less.

JEE Mains is conducted twice annualy for admissions to B.Tech/B.Arch courses offered by various NITs, IIITs, GFTIs and other colleges. It also serves as the first step for admissions to IITs.

Ad for your question, sorry to say but you cannot change your category during counselling and will be admitted under genral category.

For more information, follow the below link: 

https://engineering.careers360.com/exams/jee-main