Wasn't acting oversmart by any means, Sirus_me. People say "common" (not comon  ) and the mannerism is similar to "your" that people interchangeably use instead of "you are"....

Kanchi, I just asked 3 of my friends about the questions they were asked...(all 3 of them went to Nepal in December, got their visas renewed too)...each of them were asked general questions related to their course work like "what are you studying?", "will you return back?", "where is your college located" etc....

Your main concern is your Fs....and you should come up with decent answers as I firmly believe you will be asked about why you received all those Fs...

Regardless, good luck.