Hi Aatish,

As you may also know that 79.20 is not a great percentile in JEE mains, so their is only slight chance that you get Mechanical Engineering in Thapar University in first in-person counselling. But thapar conducts more counsellings where you are eligible to sit, if you are a student of Thapar and the chance here increases by a major number, so I would suggest you to go for any branch that you get, and keep a good CGPA. 

I wish you all the best

Thank you