I definitely think that you're overestimating the difficulty of the exam, and/or underestimating your own abilities.
ALL of the basic math concepts that you need are covered in the books suggested in this thread, so if you go over them (carefully: taking notes, etc.) you should have no problem.
I look at it this way, when I had just started a new undergrad course, I often felt overwhelmed by the amount of material I would have to learn, but at the end of the semester when I looked back at the material, it didn't seem so tough,