You are commerce student passed class 12 with eighty one percent in four subjects like commerce accounting economics and business studies so you have good marks and many options for college and course, you can choose BCom for general commerce or BCom accounting and finance to learn deeper about taxes cost accounting and banking, another good option is BBA for business and management.

1 you finish class 12 commerce with 81 percent that very good for college in tamilnadu

2 you can try Loyola College in Chennai that college give BCom and BBA course also good teacher and placement

3 next you try PSG College in Coimbatore they have BCom with CA and BCom in finance very best

4 MCC College Chennai also top for commerce and give placement in MNC company

5 Ethiraj College for women also best for girl student they give good education in BCom and BBA course

6 SRM University also have BCom Hons and BBA course if you want private college

7 Madras University also give BCom course with low fees and govt support

8 You also apply for Tamilnadu Government Arts College they have low fees good value

9 placement depend on course and your skill but many commerce student get job in bank finance IT

10 always check college website or apply through TN GASA portal for admission

Link here, check for detail course college and cut off

https://www.careers360.com/colleges/list-of-commerce-colleges-in-tamil-nadu