Yes Dear you can apply in both university through JEE main "If you are thinking to take admissions in Thapar B.Tech program you just need to give JEE Main exam and has to be passed 10+2 or equivalent examination with at least 60% marks (55% for SC/ST candidates).

For more information kindly visit this link :- https://admission.thapar.edu/

Hey Harshit.

Yes, both Thapar University, Patiala and Chandigarh University take admission for Btech/BE course through JEE mains score only. CU would also consider your mark in 12th boards or equivalent qualifying exam. You can use the link below to check other details regarding admissions.

https://engineering.careers360.com/articles/tiet-btech-admission/amp

https://www.google.co.in/amp/s/engineering.careers360.com/news/chandigarh-university-btech-admission-2018-371484/amp