Hey! Congrats on the acceptance.
If I were you, I would call the office of the registrar, and they'll direct you as such.
Telephone & Fax
 			 			                                      Telephone:                   905.525.4600                                                     Fax:                   905.527.1105                                 		    
			Office Hours  
 			 			                                      Monday, Wednesday, Thursday, Friday                   9:00 a.m. - 4:00 p.m.                                                      Tuesday:                   10:00 a.m. - 4:00 p.m. 
But I do know that to switch programs you need a pretty good average, and sometimes it's harder to get into programs because kids coming in from high school get prior advantage. (I've heard that for some programs, like Kin).
Good luck!