they want you at school all day
That would be in accordance with US immigration law which requires you to be at school present for a course whislt on a visa so makes sense.
cancel your visa. happened to lot my friends. all visa cancelled.
Can I ask why they cancelled your visa? They can't cancel it without a reason...they have to enter the reason with US Immigration.
I know they so no smoke with out fire but your post seems to make me think it's the other round - i.e you might have been the problem...
And yes I am judging you.
I'd take anything this guy says with a pinch of salt...