hi,

see thapar institute of technology offers courses on ug like b.e btech, masters courses like m.e/mtech, phd etc, you did not mention which course you want to take admission, however b.e /b.tech course admission is based on jee  main score, or 12th score, 70% seats fills by jee main score, when the final jee main score published after completing the second stage exam , candidates need to apply in thaper website filling the application form. btech biotechnology admission is based on neet score. follow the below link to know in details,

https://admissions.thapar.edu/Prospects/files/06_ADMISSION_TO_FIRST_YEAR_UG_PROGRAM.pdf