Greeting Aspirant,

As your marks in KEAM is 500 and you got 90% in CBSE you Rank will be around 1500 so according to your Rank the Following Colleges will be best for You:

• College of Engineering Trivandrum :B.Tech. in Electrical and Electronics Engineering
• NSS College of Engineering : B.Tech. in Computer Science and Engineering
• Government Engineering College, Barton Hill : B.Tech. in Electronics and Communication Engineering
• TKM College : B.Tech. in Electrical and Electronics Engineering
• Government Engineering College, Thrissur : B.Tech. in Mechanical Engineering

Hope My Answer Helped You.

Best Of Luck For Future.