I used to smoke at school all the time, saying that i would not recommend it !
I smoked in the morning before school and i used to have a bong or joint at lunch too but the worst part for me was the paranoia !
Having someone look at you and ask "you ok man ?" and it feels like the world is staring right at you !!!
Or the tutor asking you a question when your thinking about the clouds or which flavour donut your gonna have when you get out of this dam lesson !!!
These things alone can have you working up a stoned frenzy, so i say take it easy, have a little one day then increase it if you want, cos you def don't wanna go to lesson completely blitzed !
Also eating bud is stronger than smoking it AND it lasts longer, just think of all the waste smoke from a joint, and when you eat it every bit of that bud is affecting you
Let us know how you go on dude