Sadly, a lot of high schools don't even offer this class in the first place. I think the program at my old high school even got shut down.
YMMV, this is judged from local state college/community college.
about the education system, I'm of the opinion that high school is mostly a waste of time; I dropped out 2 years early and got a GED instead. (Don't try this at home.)
Personally I was easily able to get 3650 on the GED (out of 4000) which is enough to automatically get into state schools. I have no clue how it would work at a more prestigious school, but at the time that really wasn't something I was concerned with.
I don't feel qualified to say whether it was a good idea because I dropped out after I ended up in foster care (long story, my parents kicked me out after I told DHS about some incidents). Regrettably I wasted several years after this doing nothing but smoking weed and playing video games due to a general lack of motivation. I'm back working on stuff now after quitting games altogether - splitting focus is apparently an impossible task for me.
In other words, I'd expect the AP Computer Science class to be roughly equivalent to "CS 101" or "CS 1A", or whatever they happen to call the CS class where you learn what about conditionals, loops and basic variables is.