After joining IITKGP a number of freshers are highly motivated to go for a change of department.That number decreases after a couple of weeks and becomes even lesser after the first mid semester exams. However, I feel its important to remain motivated and never give up hope until the end of the freshman year.Also, to get a change in department it is important to attend classes fairly regularly.
The essential thing is studying regularly. Starting to study only a couple of week before the exams is detrimental to hopes for a department change. All the best to the new Kgpians!!