Okay, here's your best chance to pass, over 85% do...

Bleach your hair with 40 volume peroxide, wash the bleach out with Toxin Wash or a shampoo with the highest propylene glycol content you can find. Redye your hair, wash the dye out with the same shampoo.

Repeat a few days later. If possible make sure the second treatment is at least 10 days or so after your last session.

The day of the test, make a baking soda paste and rub it into your hair(this opens the cuticle). Rinse. Then follow with a full TW and full Zydot treatment.

This is by far the best program for heavy users with little clean time. While nothing is for sure, hair tests are beat regularly with this method.