Like killer said, use your own discretion. Home tests don't test for validity as strictly as other drug screens so dilute as much as possible. Since you don't have to worry about that stuff. Really it's up to you but i'd try to abstain if it means you can just toke up later. Since this seems like you won't be regularly tested i think it would be a smart move to make sure you pass this one so you don't have to deal with unnecisarry hassles from the parents