ok this what i did and worked and ill give you a great reasoning why it works too..

i know you dont have a clue when the test is but if by chance you get somewhat of an idea this may be a life saver

Take a j-e-l-l-o packet and mix it with a bottle of water and drink it right away then start drinking lots of water. if you know when the test is try to take one or two pisses before then. and this should last up to 40 minutes. (Make sure it is not a sugar free jello packet)

The reason this works is because THC is stored in your fat. Your body uses fat to burn as energy thus relecieng THC into your blood stream.
The sugar amount and other ingredients in the sugar sends a singal to your body telling it to shut down the fat burners because the amount of sugar and other chemicals in jello are suffecient enough for a short time frame to substitute to use for energy.

Hope this works for you.

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"Party Hardy Rock N Roll Life Is Short Smoke A Bowl"