well sice there giving u a hair test thats going to suck bcause u cant get around that unless u get the shampoo but that dosnt allways work i hurd that if u bleach ur hair it would be harderd to tell but i would rather cut off all my hair b4 doing that.... and depending how long ur hair is its like a big long ass time line that shows every thing uve done and it traces back over 4 months and also ur schools fucking gay thay shouldnt be able to do that unless ur eather trying out for sports or applying for a job there but yea idk i hope u get lucky and pass or just dont go that day lol if thats possable