Hello Prajeeta,

Hope you are doing well, As you've mentioned that your engineering ranking  in kcet 2021 is 21440 & comedk rank is 17990, with these ranks your chances of getting CSE seat in top colleges are low, But yes you can get CSE seat in KLE Institute of technology, Hubli . Here are the colleges where you have good chances of getting cse seat through kcet based on your rank:

New Horizon College of Engineering, Bangalore

KLE Institute of Technology, Hubli

Sahyadri College of Engineering and Management, Mangalore

KLE Dr MS Sheshgiri College of Engineering and Technology, Belgaum

NIE Institute of Technology, Mysore

BVV Sangha's Basaveshwar Engineering College, Bagalkot

PES College of Engineering, Mandya

REVA University, Bangalore

You can predict your college for KCET 2021 by following link based on your rank:

You can also predict your college for comedk 2021 by using college predictor tool:

All the best!

Hope this helps you