Meanings

We go to school, to attend "CLASS" .
C.L.A.S.S. = Come Late And Sleep Silently.

at home, we have to "STUDY".
S.T.U.D.Y. = Sleep, Tv, Unlimited-sms, Dota, Youtube.

in class, we're given "HOMEWORK."
H.O.M.E.W.O.R.K = Half Of My Energy Wasted On Random Knowledge.

while doing homework, we refer to "TEXTBOOK".
TEXTBOOK = TEXTing + faceBOOK.