i want to study any one of the following 3 branches:1. Computer Science engineering2. Mechanical engineering3. Electronics and Communication Engineering

May I know your community. So that prediction will be easier.

My community is OC

Hey, for OC community it somewhat difficult.
For ECE you can try these colleges:
Saranathan college of EngineeringChennai institute of technologyNational Engineering collegeRamco institutePSNA collegeValliammai Engineering collegeSairam institute of technologyVelammal institute of technology thiruvallurFor mechanical
Mahalingam college of EngineeringRajalakshmi Engineering collegeJPR Engineering collegeVelammal Engineering college thiruvallurRMK collegeVelammal college maduraiSri Krishna institute of technology coimbatoreSairam Engineering collegeFor CS
Chennai institute of technologyValliammai Engineering collegeSona college of Engineering and technologyPanimalar institute of technologyKarpagam college of engineeringSaranathan college of EngineeringRamco institute of technologyPSNA college of Engineering

My cut off is 171 ....BC community ....can u suggest some good colleges in cbe for me

Dr.mahalingham collegeHindustan college of Engineering and technologyHindustan institute of technologyKarpagam college of EngineeringNehru institute of technologyRVS college of EngineeringSri ramakrishna Engineering collegeRamakrishna institute of technologyTamilnadu college of engineering