Hello, I hope you are doing well

Category 3A falls under the OBC Category, and EWS reservation is for those Candidates who belong to General Category and whose annual income from all sources combined is less than 8 lakhs per annum.

Those Candidates who belong to General Category and do not claim any benefits of OBC,SC,ST only are eligible for EWS reservation.

But since 3A belongs to OBC, you are not eligible for EWS certificate.

You can apply as an OBC candidate for the competitive exams you want to give.

Hope this helps