YAY! A question I can answer :-) I used to be an Assistant Director of Education for a college test prep center. I think that learning the test-taking strategies and being familiar with the test is VERY important. You can either do this through one of these classes or a with a private tutor.
(We're almost the same age, so I'll give this example--and where I'm from the ACT was the test to take.) When I was in high school, on the ACT, everyone talked about the "magic 30"; if you made a 30 on the ACT, you could go to school ANYWHERE--Harvard, Yale, you name it. When I worked in college test prep after my first graduate degree, it was so competitive, students had to have perfect scores--a 36, community service projects, maybe a sport in which they excelleed--in short, the competition has gone CRAZY.
I now do private tutoring occasionally for college test prep. (I'm a professor and writer, and I don't really do it for the extra money--though that's nice, but I think it's an important service because of social class issues.) Wealthier parents are paying astronomical amounts of money to have their children tutored to get them into the school they have picked out for their children. I have been offered $200 an hour for private tutoring by desperate parents--this was a student who had been kicked out of school for assaulting another student and no one was supposed to offer him services--and I didn't.
Certain tutoring centers charge $60/hour for private tutoring and the tutors only make $14-$20 an hour, the rest is all profit. I meet with students at the public library for $20 an hour. If you do private tutoring, you might have to round up different subject area tutors. The SAT is divided into Math and Verbal; the ACT is Math, Science, Reading, and Social Science. I am NO GOOD at Math, so I would never advertise myself as being able to help with that... So, know if your tutor can do all sections or know that you're going to have a few tutors.
I think the Princeton Review test prep books are really good. When I tutored my best friend's daughter, we just used the book that was on reserve at the public library so my friend didn't even have to buy a book. My best friend is also a Math professor, so she could help her daughter with that section.
I happen to like Kaplan Test Prep (that wasn't who I worked for), but I love their history. After WWII, Ivy League schools thought they had too many Jewish students, so they raised standards requiring higher test scores for Jewish students to keep them out. Kaplan was developed to help Jewish students get the scores they needed to keep getting into the Ivy Leagues. YAY. A great story, huh? I've worked for Huntingon Learning Center, Sylvan Learning Center, and doing private tutoring, and there are good things about all of them. I don't know anyone who has done ACT/SAT with Kaplan, but I know people who've done LSAT (Law School Prep), GMAT (Med School Prep) and GRE (Grad School Prep) with them.
Feel free to private message me with any questions. I'm really excited for your daughter. I don't have kids, but I think pre-college is the most exciting time of anyone's life. It's probably why I became a professor :-)
One other thing, I don't know if they still do this, but when I was in high school, the way they figured the PSAT score was doubling the verbal score and adding it to the math score. If you were verbally strong, this made your score so high, it made you look like a genius. I got the highest PSAT score in the history of my high school, and it wasn't good for me because I didn't realize how important the math would be to me later on. I thought I had it made. If they still figure the score this way, PLEASE explain to your daughter that BOTH math and verbal are important.
EXCITING!
~S