I can tell you this. My test had Math, Law, Drug, Procedures and many other questions on it. By far I feel like the Law and Math were most prominent.
It's important to certainly study the Math and Law side of things. You will need to know some formulas (I.E., temp conversions, ratios, Compounding Formulas). You'll also want to study the top 200 drugs and SIG abbreviations. I find it best to get a set of books to help study for the exam, although, this website offers a great source of practice tests and many other things. So because of this website and books I PASSED my test today.