If you exercise and take fat burning supplements you will be ok....work out hard (Cardio) till 3 days before the test.

Now before the test (Day of) drink lots of water and take a b-12....when you take your test you piss should be very light yellow and this is only because of the b-12 otherwise it should be clear.

Iv done this many times with success....if your really worried you should subsitute your sample works 100%. There is threads on this so I wont go into detail.

Dont take quickfix crap from the store you may only end up being
disappointed.

ALso drink braggs organic apple cider vinegar 3 tbl spoons a day, get it at a health food store this will assist your body in fat burning plus you will recieve numerous other benefits...you should keep taking it for life. Try it. Its amazing....just do a search on it and you will see what im talking about.