i have same situation like yours i just ttok my approval letter to the counsler and she told me i don;t have to take any more classes so i didn't had to register she just terminate my I20 and change my status to H1. but you already paid half of your tution i don't know they will give your money back or not but once your I20 is yerminate and change your status to H1 you don't have to go to school as per my knowledge. make sure that whenever you take your approval letter they change your status and they will give you one copy saying you I20 ahs been terminated and the reason is "h1 approval".