I'm currently a junior; I did AP Precalc in my sophomore year, and I got a 4.
This year I plan to take AP Calc AB along with AP Physics 1 and the SAT, and next year I'll likely take AP Chem, Calc BC, and Physics C Mechanics. (IDK about chem tho.)
My main goal is to study aeronautical/aerospace engineering; mechanical engineering would be a second choice.
Your senior plan may be a little heavy, but it's all in courses that will seriously help you out in your college journey as an engineering major. A good score in AP Chem, BC Calc, and Physics C Mech will probably knock out a really good chunk of your first year courses in college, and will help you focus on more engineering-specific courses or advance to your second year courses earlier.
It can vary a lot between schools, but check with your teachers/counselors if you can just take Calculus BC. CollegeBoard intended for the BC Calculus course to include the AB portion within it, so the choice is supposed to be taking either class rather than BC after AB. Again, this varies between schools, and I have friends whose schools forced them to take AB before BC, which may be the case for you.
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