I am pretty sure if you transfer to new university during course of study and go to nepal with valid new I-20, u can use old visa to come back, no need to re apply for visa. but since u r not transferring now and ending the college and going back, not sure, guruji looks to be lucky. 

I would advise to join new school over here, get I-20, then after a semester go back to nepal with signed I-20. This may possibly not require a new visa while returning back.