Replying to Soo testing this week

So im prettty sure that im going to begin getting tested for weed this week
and im fucking pissed off
and i was wondering if there were any ideas on how to try and beat the test
im a runner and i hydrate a lot, so i was thinking that i could try and dilute the test by hydrating?
Thanks a lot for any answers and i really need a response quick cause i dont wanna get caught on this thing.
By the way if any of this helps
im 17, 5-1, 155 lbs
run a lot, every day-fast metabolism
but also usually smoke almost every day- 7+ times a week
anyone have any idea how long it will stay in my system