70% accuracy on LSAT CR
is pretty good, considering that they are considered to be much tougher than GMAT CR. You need to check what errors are holding you back. If its just a time issue, you need to think through the deduction process quickly, using the same strategy you use when in an un-timed test , only faster.
Here are some links which may be of use to you:
CR Methods - An approach to find the best answerscr-methods-an-approach-to-find-the-best-answers-93146.html
The Bang, Bang CR Guide (A comprehensive guide w/ examples)cr-guide-100473.html
Hope this helps.
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