Hi,

You could call up the university and explain if you have a problem with the centre. I have found that they do help out and that exam centres sometimes can be changed during slot booking. I suggest you mail them and call them up with the query and they will help you with it. 

Hi, Out of the preferences of exam centre you choose the ones you are convenient with but once allotted exam centre cannot be changed. Also the branch can be changed after one year completion but there are certain terms and conditions like all you should have cleared all subjects, your attendance should be good enough etc. Good Luck.