If you choose the incorrect answer on BR that means you need to go back and review that question - there is a good chance that either you are second-guessing yourself too much, or you may have an issue with the underlying content of the question.
If that's going to bother you then you might want to switch to a different test center. This site has reviews of test centers: http://www.simugator.com/lsat-test-site-rater.php