Hi Mannik.

With a rank of 161809 in JEE Mains 2020, it is difficult to get CSE in GNDU. You can get admission in B.Tech CSE, Guru Nanak Dev University (GNDU), Amritsar if your CRL All India rank in JEE Mains is up to 150000 according to 2018 cut-offs for the general category. But you still have a chance as these cutoffs change every year. Don't miss the counselling, you might get CSE in the last round.

All the best.