Dear aspirant,
Thapar university does not conducts it's own exam. It takes ont the basus of jee mains. So you can't take admission directly on 12th basis. But you can take admission through management quota in which you have to give donation. The donation will be in lakhs. So go for the counselling if you have decent marks in jee mains. It's cut off is less than the Nit's. I'm providing you a link in which you will get each and every information related to admission and important dates. Check it out.
https://www.google.com/amp/s/engineering.careers360.com/articles/tiet-btech-admission/amp
All the best..!!
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