Hello sir, your son may get below mentioned colleges for his rank and 3BR Category.

• Sai Vidya Institute of Technology (ECE)
• ACS College (CSE)
• Reva University (CSE, ECE)
• Presidency University (CSE, ECE, EEE)
• Global Academy of Technology (CSE, ECE)
• Canara College (CSE)

https://engineering.careers360.com/articles/kcet-cutoff

https://www.careers360.com/kcet-college-predictor

Above links provides you with more colleges.

Thank you.