Hello
Abhi , From some research on internet I found that, Yes you can change your preference or choice of subject in the second or last round of your upsee counselling because at the time of last or second counsel many students take admission in other private colleges so seats are vacant.

Hope it will be helpful for you :)

Hi Aspirant!

According to guidelines provided by the exam officials you can not change the locked choices after round 1.You right to change the choice is upto before choice locking.After that there is no way by which you can change the choice.

Hence you can not change your choice in 2nd Round of counseling.

I hope it helps!

For more information you can follow up this careers360 article:

https://engineering.careers360.com/articles/upsee-counselling
Happy Hustling!