I'm sure you've heard of what I'm about to type before. Just a tip from personal experiences... well not for now, but further down the road, forget about sending your child to special SAT prep programs, save yourself the money. I've been through a couple of them and they don't usually help. Only thing they do is FORCE you to set aside some time (the classes) to review the material for the SAT's. If your child can discipline herself, or if you can just make sure your child dedicates some time to review, just grab a couple of practice SAT books and go through the practice tests. SAT is all about taking tests, the more you take, the better you get. When I took the SAT's for the third time my senior year, I was able to recall answers to many of the questions. (You won't believe how often they reuse past questions) The last time I took that test was a joke... so in conclusion, just keep taking practice tests, forget about memorizing vocabulary, learning the Greek prefixes and suffixes or learning equations (they give them to you anyway)! It's like a skill learned, practice makes perfect.
On another note, don't worry about what calculator your child should use. If you can see through the problem, there is no need to use a calculator on the test at all... I'm using a TI-89 now in college (mainly for games)... and it's a great calculator. You could get by with a cheap calculator now, and then get your child an 89 when she's in high school. Otherwise invest in the 89 now so your child can get comfortable with it.
by the way... best wishes!!!