Presidency University, Bangalore

Hi Arpit,
Presidency University, Bangalore is a private university established under the Karnataka State Law, by Act No. 41 of 2013. It is not affiliated to any university as it itself is a university.
An autonomous college is a college which is affiliated to a university, but which has an internal management of syllabus and examination.
In a private university, the syllabus is designed by the university, and the exam as well as the evaluation too is done by the university.

Hey Adnan, it is doubtful that you will get a seat through COMED-K. So, what I would suggest is to take the admission directly in the university, rather called as 'Management Quota'. The fees would remain the same. But, you'll have to book the seat as soon as possible because the university's seat distribution works on first come, first served basis.

Find below the link to Shiksha's best college predictor for COMEDK which will help you know about various colleges and streams that you may have a chance to fit in this year: https://www.shiksha.com/b-tech/resources/comedk-college-predictor.
Feel free to raise more queries. Wishing you all the best.

Of course, PUBDET is the entrance exam for admission in B.Sc in Life science. This exam takes place at the end of the April every year and the application time frame is early February before +2 Board exams

If you want to pursue petroleum engineering then I would suggest applying in UPES, Dehradun. It is one of the best college in India and it also has better placements.