Yeah, I believe that the strategy that you should go with is what Skink suggested.
Last competition, neither my partner or I studied for Crime Busters, (we were focusing on other events) and when we got to regionals, we actually got 8th place, which isn't too bad, considering that we did nothing to prepare. If we had prepared, though, we could have easily medaled.
Anyway, we had basically identified all of the powders, and done the chromatography, fingerprints, etc. Our problems, though, were that we missed a few liquids, and we didn't really write a through essay. So yeah, basically just get the powders, and as much as the other stuff done as you can, and even though there's a change that you won't medal, you'll do fine. (Although I don't suggest not studying like we did... xD..)
Anyway, make sure that you leave as much time as possible for your 'essay' and cleaning up, etc.
i know that i should be in bed
and its almost 3 am
but when i close my eyes i can only see miles of headlights
fleshing out the distance