I should let you know of something interesting about the LSAT: When you get your score, you actually get a copy of your answer sheet and a copy of how the computer interpreted it. You could, in theory, find a mistake and argue over a circle that was scanned incorrectly.
I don't know whether that knowledge changes your strategy, but it's nice to know you'll have a chance to double check the machine (I always wonder when I erase an answer whether I'll miss it and just never know - but the LSAT isn't like that).
You get a copy of the test book too - they shrink it down to 1/2 the size. Wierd.