Deja Vu

Endless rows of bowed heads and the jerky writing movement of the arms.
Restless prowling teachers and useless sputtering fans.
The swift glides of pen onto paper and a dull ache in your wrist for writing too much, too fast.
IC at the top right corner of your table and a swill from your water bottle every now and than.
Clammy sticky feeling and heavy heat.

Tell me how is this familiar.

I'll give you a hint,
it starts with an O.