For admission to Liberal Arts and Science College Thapar, your JEE main or NEET score will be taken into consideration, since you did not mention the course you want to apply for. The application form submission is open till 31st July 2020. You can apply for your course from its official website online.

https://admissions.thapar.edu/online-application-form.php?_ga=2.129299404.1536689821.1591094905-1191406015.1591094905

I hope this helps you!