to give you an idea of what e does, ask yourself, what does ritalin do? very similar to that, theyre both meth-somethings. not like methamphetamyne which is totally bunk shit that will make you extremely paranoid. unlike methamphetamyne mdma is a seratonin precursor and a triptamine. that means it will a) effect every pleasure sensor in your body, and b) trip you the hell out kinda like acid, a little bit like mushrooms (acid is usually stronger than mdma by quite a bit).
there is no way to tell whats in the pill unless you test it which can be done either by licking it or with a test kit. honestly school isnt a great place, you will get a whole bunch of unwanted attention. go see a movie after school with some close friends, or go hang at some *ahem* girls house... ectasy is a very touchy feely drug becausen it feels so good. you will be extremely open and silly.
if you have some weed, be sure to smoke that, and have a great playlist of music.
honestly though, ectasy is harmless unless it was cut with something bad. so dont take more than one until at least 6 hours after youve started to jive. its easy to take too much but ive never seen some one overdose or have a bad time unless it was cut with something.