Dear Aspirant,

If you have got admission into a college then there are many procedure you can change your branch.

The colleges provide the Integral up gradation if the seats are vacant in your college to fill up the core branches in your college.The integral rank depends varies from college to college.

OR

You can take admission in whatever branch you get you can change it after first year of college by writing an application to the concerned authority to change the branch. In this case you should have great score in your first year to change the branch.

You can use  the college predictor link for better and quality information on colleges based on your rank:-

Hope this helps.

Good Luck!