Hello Devansh

Sliding round was introduced by IPU in 2016,in this round after 3 counselling rounds,students gets upgradation in their choices,I mean they get better colleges and most likely preferred college, so if you are in between cutoff rank,you have a good chance of getting seat in your first choice but it also depends how many students applied for that college and how many seats are vacant after 3 rounds of counselling.

So there's no surety, but there are chances of you getting seat in your first choice college.

I hope it helps

Best of luck