| Wow! We are very similar re: procrastination. :-P
Well, here's what I would recommend: pick one, if at all possible. I, personally, would go with econ, since I think it's easier to grasp quickly. However, if you're really good at science or have a background in biology and you want to do the bio test, get the Cliffs AP Bio and use that.
If you can't decide between the two, I'd recommend going with the test that's later. :-P
But, seriously, good luck. I totally empathize with the procrastination thing. :-) | 
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