Colleges in Punjab

No. Unless you clear your PUCET pg, you cannot get admission in MSc chem in DAV Chandigarh. So first clear it and then try for your MSc. Best of luck.

Depends on the course you are applying for. If it's for B.A. You might get your name in 2nd merit list. Your percentage is good, Keep your hopes high. All the best!

No dear, there is no entrance exams after that.

Yes, you can get the admission in D.A.V College because the eligibility criteria for admission is passed in 10+2 and seats available in the college also matters.

On page number 7 you can see refund details of attached link-:
https://admissions.thapar.edu/UG/IMPORTANT_DATES_AND_INFORMATION.pdf.

In counseling you will be given choice of college as per your rank. You have to deposit fee and book your seat in the given list of colleges.

You can compare here both these
https://www.shiksha.com/resources/college-comparison

As far as I have the general facts of the Jaypee institute of IIT in Delhi for CSE B.Tech I would suggest you to take admission here only because this college has a very good faculty and a very good syllabus for the students because that do not what give burden on the students and provide a very good exposure of studies.