I, too, think you DO know the material, and there is something about the test-taking that is hanging you up. Is there any way you could get a big book of practice tests and just practice, pretty much nonstop, between now and then? If it turns out, through doing that, that there are certain subject areas you are still not sure of, you can do some extra study in those areas. Otherwise, I have a feeling you won't be addressing what is really causing you not to pass.