Need help ASAP

Okay so I'm joining the National Guard and I have my physical this friday the last time i smoked was the 27th of feb and before that I went almost 2 weeks without smoking and i use to be a daily smoker before that I really need to pass my drug test because my career in the military is very important to me so I need to know what are the best products I can take to be clean for about a whole day because I don't actually know the exact time I will have the test done anything I can try that will help me out will be gladly appreciated thanks