Below are the three top private colleges in Rajasthan

-Birla Institute of Technology and Science, Pilani
-Banasthali University, Banasthali
-JECRC University, Jaipur

To check the complete list you can refer below link

Top Private Engineering Colleges in Rajasthan

Good Luck!!

You can check the top ranked colleges in Jaipur in the link below:

 

Jaipur Engg colleges

 

You can also consider the reviews and ratings for it.
Good Luck.