Hello Neelima,

Hope you are doing well, as you've mentioned that your rank in eapcet-2021 is 12843, with this rank your chances of getting cse seat in top engineering colleges are low . But yes you can get seat in other good college. Wait & try for all rounds. Here are the colleges  where you have good chances of getting seat through eapcet:

Andhra University College of Engineering, Visakhapatnam - BE Chemical engineering, Btech Information engineering, Btech Biotechnology

Jawaharlal Nehru Technological University College of Engineering, Kakinada - Btech Chemical Engineering, Btech Petrochemical engineering

JNTUA College of Engineering, Anantapur - Btech Civil engineering

Gayatri Vidya Parishad College of Engineering, Visakhapatnam - Btech Electrical & Electronics engineering, Btech Robotics engineering

Sree Vidyanikethan Engineering College, Tirupati - Btech Electrical & Electronics engineering, Btech Computer science & systems engineering

Velagapudi Ramakrishna Siddhartha Engineering College, Vijayawada - Btech Electronics & Communication engineering

G Pulla Reddy Engineering College, Kurnool - Btech Computer science & technology

G Pullaiah College of Engineering and Technology, Kurnool - Btech Computer science & engineering

You can also predict your college for ap-eamcet 2021 by using college predictor tool:

All the best!

Hope this helps you