If Wells really wants you they will call you ASAP. I had a group interview on 4/3/12, 4/5/12 the BM called to see if I was still interested which I was of course. Scheduled an interview for 4/9/12 BM called me the same day in regards to my school hours cuz the DM had questions. I told him it was no problem my professors would be understanding. I even called him back just to reiterate I was really interested in the position. But yeah when it comes to school and work schedule show you can balance and even take a online class etc I'm a 22yo graduate student so my classes are very flexible. Also, call your Recruiter to see what's going on or even the Wells 1800 recruiter number.
But good luck guys :)