7Sage suggests you should go through all the questions you feel confident about first, leaving harder ones for your second-go-through. This makes a lot of sense for LR, but I don't know how the approach would work for RC. Do you go through all of a RC section and leave all uncertain questions unanswered before your second pass OR do you do you first pass-through of a passage and then hit the unanswered Qs in that passage before moving on? (or another approach)
There's just a big difference in terms of the information you have to keep in mind between LR and RC. I would love to hear people's strategies on this...
Check out powerscore's crystal ball. They predict what the upcoming LSAT administrations will look like and provide tests and sections that have similar questions. They've been accurate in the past.