How do i get THC out of my system desperately?

i smoke lke once a week every friday at the mall and maybe but like every 2 weeks ill do it other than friday now i havent smoked for 1 week and i really dont think it's out of my system and i know im gunna need to p a drug test so like whats the best way to get it out of my system cuz i heard that water, vinigar, and cranberry juice is a myth and that it doesnt really work so i really need to get it out of my system fast......any ideas i need to know or at least how long it will be in my system for =/ please HELP!!!!!