I agree with what has been said above: if you are PharmD material, you must be able to pass the PTCE with 1-2 weeks of studying.
HOWEVER, as with pharmacy school, this statement mostly refers to your sense of what you need to focus on and what is useless information that you won't be tested on. It's not how MUCH you study but how SMART you study.
Be sure you know your math. Be comfortable with doing ratios, and working with percentages. It sounds like easy math, but if you're not prepared, it can be difficult (for example, if you have 30ml of 20% solution, how much minimum ml do you need of 70% solution to make a final solution of 45%?).
Be sure you know basic law. ie, what needs to be on an rx script and what is unnecessary, what the name of the DEA form is to transfer morphine to your store, how long a controlled rx is good for, etc.
Be sure you know basic drugs. No not all the brand and generics, but you should know the common endings (ie, -statin, -itidine, -lol, -mycin, etc) and what type of drug it is.
The test is a piece of cake if you correctly prepare for it! 🙂