i used to smoke very, very heavily for many years with no stop. i lived in humboldt for a good while and spent 420 there, along iwth following the dead for awhile. well i got put on probation in july and although im not at all fat, it took me only 9 days to get clean without doing anything. I didnt exercise, i didnt flush my system, i didnt drink a bunch of water. and my metabolism isnt really that high. so since you have almost an entire month to get clean i assure you that you can do this. just speed up your metabolism, eat a healthy diet (less sugars, becuasse your body metabolizes them first) and also try to stop drinking alchohol. your body also metabolizes alchohol first before anything else, and you need your body to be getting rid of the THC metabolites before anything else. so even if you are a very heavy smoker, thats about 28 days, and as long as you are extremely fat youll be ok. just get a few home test so you can test yourself beforehand to make sure. if u fail the day of, or the day before, then consider suplementing your piss or diluting it. otherwise do it the right way