Subham I am sorry to say that with your 25372 GMR rank even when you if have an OBC quota reservation, you will not be able to get Chemical engineering in the top colleges like Jadavpur University, CU, Makaut etc. To get a chemical engineering you need to have atleast in top 10,000 general merit rank.

I will recommend you to look for some other branch in the top colleges or if you want to get a better branch then you should fill up some of the lower ranked colleges. With your this rank you can still get some of the good colleges.

Feel free to ask if you have any more queries. All the best!!