You can change your preferred choices if you still have edit option in your application. But if you already submitted your form then you can't change your preferred locations. So if you that edit option then edit it before submission and if you already submitted your form then just prepare yourself for exam and you have to go there .

Hey Aman,

I have given the answer of your question. Just check the link given below:

https://www.careers360.com/question-what-can-i-do-for-changing-center-for-entrance-exam-and-how-can-i-change-it-what-method-can-we-apply-for-this

Good luck !