Hi Aspirant ,

The minimum marks (pcm)  in qualifying the exam for ST category is 40%. 99% is a really good score . You have chances to get into Anna University for CSE group .For other state quota , the initial deposit for counselling is around 5000/- .An Applicant who declines after the publication of Tentative Allotment OR an applicant who is not allotted a branch during Provisional Allotment shall be eligible for 100% Refund in the Initial Deposit and an applicant shall be eligible for 80% Refund after Publication of Provisional Allotment if he/she does not join the allotted Branch.

For other colleges , kindly use this predictor tool : https://engineering.careers360.com/tnea-college-predictor?icn=TNEA_clgpd&ici=TNEA_article_view_text-mapping

BEST OF LUCK.