Anonymous wrote:OP, I'm sorry but a lot of the info above is incorrect. I'd hate for you to make decisions based on this. Please talk to the guidance counselor at your son's school and refer to the College Board's course descriptions, which clearly outline what the two courses offer:
http://apcentral.collegeboard.com/apc/public/courses/descriptions/index.html
Calculus is important for many technical fields, so I wouldn't just toss it out of the running without thinking about it.
Which part is incorrect?
This is from the link you provided
AP Calculus AB is roughly equivalent to a first semester college calculus course devoted to topics in differential and integral calculus.
AP Calculus BC is roughly equivalent to both first and second semester college calculus courses and extends the content learned in AB to different types of equations and introduces the topic of sequences and series.
The reason you don't need both is big part of BC covers AB materials as stated.
In MoCo, kids go either AB or BC after pre-Calc. In some school districts (and sounds like OP is living in one of those districts), kids are required to take AB before BC. My kids went to BC after pre-Calc and did fine. I personally don't think it's a good idea to spend two years of Calc in HS.