Thanks, chenchuan. That's helpful.

Mominsac- if I had to choose, I'd think about some other metrics
1) If they offer AP classes, how many do they offer, and do the classes fit my child's interests?
2) How do the students do on the AP exams -what percentage of the grades are "passing" (or better yet, what percentage are "5s")?
3) Does the school offer arts, sports, clubs, etc. that interest my child?
4) What is the average SAT score (or middle 50%)?
5) How do the students fare in college placement? How is their guidance/college counseling department?

Some of this info may be available on the school profile, which is often on the school's website. I've been able to find some data for basic comparisons in our area using just the schools' profiles. Good luck with the decision.