It's possible to raise your score significantly, but I wouldn't try to do it with one of the commercial test prep books (Kaplan or PR). Invest in either a Powerscore or Testmasters class if you can. If not, get the Powerscore Logic Games Bible and Logical Reasoning Bible and study those. Get copies of actual previous LSATs from LSAC and test yourself on those.The problem with Kaplan and PR is that they make up their own fake LSAT questions. It's definitely not the same thing as the real thing, and it will hurt you on the actual test.