First of all, congratulations on getting a rank of 3000 in Consortium of Medical, Engineering and Dental Colleges of Karnataka Under Graduate Entrance Test! You can get decent branches given your good rank in the examination.

You may easily get Computer Science and Engineering or CSE in the following colleges:

Bangalore Institute of Technology
Dayananda Sagar College of Engineering
BMS College of Engineering

Moreover, you may also use our college predictor to see your chances is various colleges:
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Hope I have answered your question. All the best!