In my opinion, if you are interested in CSE, you should go for IIT BHU VARANASI. Some points to prove my opinion right are:
IIT BHU offers better packages than NIT Jalandhar.
IIT tag is very valuable
Study environment, facilities and academic culture at IIT BHU is much better than NIT Jalandhar.
Initially Pharmaceutical may seem challenging. But with time you will adjust.