Hello Saurabh Singh

To get into Petreoleum Engineering for best colleges you need write enrance such as JEE Main (Joint entrance examination ) , UPESEAT (  University of Petroleum and Energy Studies, Engineering Aptitude Test. ) and get qualified.

You can refer below link for getting a more information on UPESAT and below link for information JEE

https://engineering.careers360.com/articles/upeseat

https://engineering.careers360.com/exams/jee-main

Regards