Hello Rahul,

Hope you are doing good.

As you have mentioned that you can get rank upto 15500 ao I will provide you with some colleges which matches with your rank. My college list will be as per the 2018 cutoff, so don't except it to be exactly same thus year also. There will be some chances as cutoff changes every year. 

• Sri Ramakrishna Engineering College (Biomedical)
• Sri Venkateswara College of Engineering, Kanchipuram (Automobile)
• PSG College of Technology - PSGCT (Textile)
• Loyola - ICAM College of Engineering and Technology (ECE)
• Government College of Engineering, Srirangam (EEE)
• Alagappa Chettiar College of Engineering and Technology (EEE)
• Sri Venkateswara College of Engineering, Kanchipuram (Biotechnology)
• Alagappa Chettiar College of Engineering and Technology (Mechanical)

Hope this helps you.

All the Best.