It's all depend on your concentration and hard work .and Kota is good if u are regular and do not cheat with yourself.

And there are a no. Of good college s

IIT Mumbai Delhi Patna Kharagpur

Nits and iits bits .

some good college

Rajasthan Technical University (RTU), 

Modi Institute of Technology (MIT, Kota),

R. N. Modi Engineering College, Kota

Vedant College of Engineering and Technology, Kota

Maharishi Arvind International Institute of Technology, Kota

Gurukul Institute of Engineering and Technology, Kota

Apex International Institute of Technology, Kota

Presidency College of Engineering, Kota