Hello Tejas,

If you are taking about the government colleges in Karnataka then the top 3 are -

1. NIT Karnataka
2. IIIT Banglore, Karnataka
3. Government Engineering College Hassan, Karnataka

If you are looking for private institutions then the top 3 are -
1. Manipal Institute of Technology Karnataka
2. RV College of Engineering
3. REVA University

Hi Tejas,
               Here's the Top three colleges for Engineering (UG) in Karnataka :

IIIT BANGALORE (accepted exam - jee mains)
NIT SURATHKAL (accepted exam - jee mains)
R V College of Engineering (accepted exam - KCET & COMEDK UGET)