all that shit is too much trouble!
do what i used to do...
1.fill your schoolbag with shit to eat and your bud.(obviousley)
2.leave for school as normal.
3.go to shops an get a pack of beers.
4.find a nice quiet spot far away from teachers and parents.(parks are good)
5.get fucked all day.

get one of your mates to come with you but if more than one comes the teachers may get suspicious.
or you could go on a bus run. this is fun but if your drinkin it dousnt work cuz you have to keep gettin of for a piss!