I GOTTA PASS!

OK so, I got busted at school and now I gotta pass a random drug test (piss). They're gonna call me anytime between tomorrow and Oct. 10th and tell me I have 24 hours to get the test done. The last time I smoked was like...Sat. night LOL I know I'm retarded. I was actually clean the entire month of August and then blew it cuz I was sick of waiting and needed mary jane. Well now I'm really freaked out cuz I gotta pass this test or the shit will royally hit the fan. I'll stay clean from now on I PROMISE. But isn't there any good flushes around??? And if I borrow piss, doesn't someone watch you while you take the test? And if I'm female can I borrow a guy's clean piss?