The TI-30Xa is a legal, non-programmable calculator though I ended up using my trusty TI-55III semi-programmable with no questions asked. I brought the TI-30Xa just incase they said "No" to the TI-55. Not much difference though the TI-55 has Correlation calculations which is one of the longest formulas, though I can't remember necessarily needing the calculator for it. The test is designed to require only the cheesiest of calculators. The TI-30Xa has Sum of, mean, SD(both sample and population), permutation, combination, factorial, square and square root. It was only about $12 and came with simple instuctions. Learn to use it as you go, along with a fair understanding of the formulas. I wrote them on note cards and sifted through them several times a day to memorize them.

Let me know if you need any further info.