Petroleum Engineering

Yes, surely, you will get the seat. Don't worry.

Hello Mohak,
Enter your rank in the link given below and get the list of best colleges:
https://www.shiksha.com/b-tech/resources/upsee-college-predictor

Mahesh,
All streams are interesting in there own way. So, you need to see what you are interested in. What is more important is your interest and inclination towards a branch and you acumen to grasp it. Also, at times the place of learning adds to your interest in a thing. Choose a university that is going to make your learning further interesting.
There are many good universities around that are providing quality education using innovative teaching methods. Even the placements are very good.
Check the websites of some universities like LPU, SRM, SMU, etc. Some of them even offer scholarships.
Good luck.

Amity, Noida is one of the best campuses for petroleum stream and it is good in terms of salary and placement. Petroleum branch has high scope in engineering.

Yes, it is best for petroleum engineering. You can check it by yourself here –
http://www.indiaeducation.net/careercenter/engineering/petroleumengineering/

UPES rank is 3rd in terms of petroleum engineering. 1st is IIT, Bombay and 2nd ISM, Dhanbad.
You can check the ranking here –
http://www.indiaeducation.net/careercenter/engineering/petroleumengineering/

To be frank, petroleum engineering is both easy and difficult. Easy if you love chemistry subject, and difficult if you are not interested in chemistry.