Go to
www.faatest.com and download the current test questions. It gives you all of the questions and answers in the format that you will actually see on the computer screen when you take the exam for real. You can practice the test as many times as you want.
I think it costs about $25. I did this for all of my tests (PPL, IR, CPL) and passed all of them in the mid 90's % mark. I found it much easier to use than the Gleim books.