Sherman, set the Way-Back machine to 12 years ago.
If my memory serves correctly, the first question I came across had to do with chemistry. Started off looking VERY difficult until I got to the actual question in which they simply wanted to know what the arrow was pointing to on a standard element block on the Periodic table and what it meant(I think it was the atomic number of lead or another element). Seeing as I took it on very little sleep and on the same day I did everything that was required at MEPS(ASVAB, Medical, etc), I don't remember a lot of the test. I do know that I hadn't done physics or chemistry in over a year but managed to pull down a 57 on the test with no studying. Your best bet is just to go over some of your basic chemistry and physics stuff again, brush up on your math like algebra and exponents, and most importantly, remember to read the ENTIRE question before answering.