On the day of the test, you show up with your ID and I believe they fingerprint you and take a photo of you. Any cellphones, keys, sweaters can be put away in a locker. You wait and someone will call you in to verify your identity with a fingerprint and photo. They give you a mini calculator and dry erase board and marker for your calculations. You then start the exam when you're ready. You won't need the entire time to finish the exam. My best advice is to answer as many questions as you can and flag the ones you can't immediately answer. You can always go back to them. Remember, the cPhT test gauges the likelihood of another tech/potential tech answering the question correctly vs. it being a wrong or right answer. In a way, the test is based on a curve.
Working as a pharm tech now, I would say that pharmacology is definitely something you should know to make your life easier when you're working. Knowing the difference between generic and brand goes a long way when you're talking with patients, not so much with the pharmacists. If you can't find time to know it all before the test, definitely review and brush up prior to starting work
Good luck!