Yes !of course you can change the nit college preferences in second counselling. There are 7 round of jossa where u can get a platform to change your preferences for college .but most probably according to your rank and category you will get the proper seat .these seven round of jossa will decide your seat .

All the best for your future.and don't just forget to sit in last csab round where you can get some seat in top colleges if,by chance there is a vacant seat ,that round also plays a vital role in counseling

So best of luck!