my random drug testing situation ~~ plz help!

okay here's the deal. i was blazing twice a day for almost every day of june. starting july 5th, i stopped and i only have done it once a week ish since then. i'm going to lollapalooza august 4-6, so i KNOW what's going to be going down while im there. :stoned:

My situation is scary because starting august 14th, i go back to school.... and my school does random drug testing throughout the year. it's weird because i may NOT get tested at all.. or i could be tested right away. so in result, there's really no day that i KNOW i will be tested, but i need to be prepared for when/if it happens.

so in order to kind of work it out of my system, i have been running daily for a couple hours with a garbage bag over my body (im in arizona so its really hot) in order to sweat a ton, i've been taking protein supplements, staying away from fat foods, drinking 1/2 - 1 gallon of water a day, and have purchased labrion nutraceuticals Cleansing Renewer detox. so my questions are:

1) does anybody have any suggestions to working it out of my system? other than drinking water and tea (been doing that).
2) has anybody tried this cleansing renewer or know anybody who has? how does it work?
3) know any tricks that could help me pass on a random basis?

any help would be apprecaited, thanks alot.