As stated what schools is he looking at? My sons school offered multivariate Calc 3 after Calc bc. Most of the higher end kids take this when it is offered. . Stats is pretty easy and colleges know this. He is competing against kids that took multivariate Calc for the college seats regardless what your school offers. He is a top student. This shows rigor. Don’t downplay rigor for senior year if applying to top schools. As stated he will have to retake it in college. My son just found out that math in general is harder in college as everything else is also. It will give him a foundation to build on. Most competitive schools will discount stats and not give credit anyway. Because of this my son took a year of Stats in 3 weeks at Northwestern in the summer of junior year. He really wanted stats but would never give up a higher level Calc class for it. He said he couldn’t imagine taking it during the school year. Just to slow and non challenging but a fun math class. He liked the discussion. He is at Michigan OOS entering his sophomore year in engineering.