These are such great responses with tons of info. I just wanted to add two things:
Personally, I thought the revisit student performances were not that appealing – tons of inside jokes and loud, boisterous students more interested in the other students who were there than putting on a show. My child attended anyway and the school has been a lot better than this part of revisit day indicated.
One of the best things about Andover is science. There are many options with different levels of each course. There are 9th graders in bio, chem, and physics. If math is there, you can start with calculus-based physics. If you’ve already had chemistry, you can take a higher level chemistry and if you’ve had that, you can take organic. Each science has multiple years of study – there are higher level bio courses like cell bio, organic and potentially a chem research course in the future, and post-AP physics with fluid mechanics. Science has been extremely challenging and well-taught for my student and the flexibility has been much appreciated.