I'm an HP12-C guy too. Just beware that you'll have a slight learning curve to pick up on the RPN keystrokes; its different than any other calculator that you use.
However, you'll see that (in my opinion) the majority of experienced finance guys will recommend this calculator because, once you get a hang of RPN, the calculator will save you a lot of time.
When you get it, pick up the instruction book and look into the store/recall function and the statistical functions (the sigma key: sample mean and std deviation calcs). Those are a couple easy ones off the top of my head that will save you a lot of time on the exam.