Below are the top colleges for Mechatronics Engineering

VIT University, Vellore

SRM University, Chennai

National Institute of Technology Karnataka, Surathkal

Guru Gobind Singh Indraprastha University, Delhi

Manipal Institute of Technology, Manipal

Thapar University, Patiala

Lovely Professional University, Phagwara

SASTRA University, Thanjavur

In order to get admission you have to appear for the entrance exam like JEE Main, VIT, SRM, IPUCET

For Preparation you can refer NCERT books, Solve past  year papers and mock test series to analyze your preparation level and to know your strength and weakness.

Good luck!!