In 2017, final cutoff for Computer Engineering in Thapar was around 127 marks. In 2017, only JEE score was considered in determining the rank, so cutoffs for Thapar CSE went down. But as the cut offs aren't out yet as the cut offs may get affected by the factors like number of applicants fill the form, number of applicants finally appeared in the exam, number of questions asked in the exam, difficulty level of the exam, performance of the candidate, previous year's cut offs trends but I think 2018 will follow similar trends, CSE here may close around 30000–37000. So if you score more than 130 marks in JEE Mains you'll get a seat in CSE in the institution.

Good Luck!!