Thapar University has 670 seats for CSE students. Does this affect placements, because after seeing the number of CSE seats, I'm a bit tensed to join Thapar University?

Yes, the huge batch size can be concerning. In case, if you compare the present statistics with the 2017 batch, you will notice the seat difference. 2017 saw a peak of only about 220 seats which undeniably helped students acquire multiple offers in the span of their course period even if they were not particularly exposed to the course academically. 

Comparably, as the number of seats has drastically spiked, recruiters are often seen to only choose a handful of students who have the best skill set. The number of people getting into dream companies remains the same as before but you will need to compete with more people to get selected. 

But if you think you can particularly ace Computer Science, then you can opt for Thapar University. There you will have the opportunity to sit for the interview sessions oftop firms, such as Microsoft and Amazon. According to the 2020 placement highlights, 264 companies visited the placement drive and the highest CTC offered was 43 LPA.