Having taken and passed the Part 3 exam today, I would highly recommend one of the financial calculators.
I bought a TI30 BA II plus today on the way to the test and spent about 15 minutes trying it out before my appointment. The time was well worth it. You can test out your calculations versus the time value table to make sure you are doing it right. Why would want to use a 4 or 6 function calculator when you can use of of these? I mostly used it for FV, PV, and IRR. It is a time saving versus writing out the formulas, and another thing that helped me was that it will saves the values for these problems until you clear it.
For example, if you had a problem that required you to calculate different NPV at different rates to compare investments, this saves a lot of time.
An investment returns 2,500 for 5 years. And you need to know what is the NPV is at 6%, 8%, and 10%.
You would enter: (I'm using the brackets to denote the calculator [key] )
0 [ FV ]
2500 [ PMT ]
5 [ N ]
6 [ I/Y ]
And once you calculated that [compute] [PV] ; you can just repeat the above step replacing the 6 with an the other numbers to quickly calculate their values.
I wish that I bought one of these to use when I was studying for the exam. I think it could have helped me finish the test (I skipped a few that had a lot of calculations).
Info on the calculator from Amazon:
"The more hard-core worksheet mode includes tables for amortization, bond, depreciation, and compound interest. If you're not familiar with such calculations, the very helpful user's manual will guide you through the process. All previous worksheet values are stored in memory, so you don't have to retype all the bond maturity or cash flow analysis figures." It says it can figure out uneven cash flows, depreciation schedules, uneven cash flow analysis, and advanced statistics. I haven't used an HP 10bII, so I can't say which is better.