though it is mentioned here I strongly urge you not to.
ONE, you don't understand what women like in smell, therefor you would not be keen to there tastes.
TWO, your in highschool most kids don't wear expensive colonges. So buying colonges to mix would be a waste of money when you can buy a bottle of Auqa Di Gio and stand out.(when you get older it will be wiser to use a less known colonge but in HS it's a waste of time to go searching for something like that)
THREE, If you feel the chemical urge to mix scents there are oil kits for making your own colonges. If I remeber one of the women who posts here used to do that (Miami something?)
Again I would do so in the presence of a female or better yet have a female friend do it for you.
As to mixing random colonges I've tried frequently and it's almost always worked best to wear one colonge at a time.