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I don't think having only AB would matter much, even for an engineer.
All in all, the community college class was 'very easy' according to my son, and the transition to Calc in HS has been with some bumps this year
If you are assuming that high school teachers don't hold a PhD. you would be wrong. My wife teaches with several PhD's at her formerly "at risk" public high school.
My S took AP Calc BC his sophomore year and got a 5 on the exam, A's in the class. Since S expressed interest in a college major in the math/science area, his calc teacher encouraged him to take a more rigorous route than the next class in the HS, which was AP Stats. Since S had already taken some summer classes with JHU CTY, he opted to take their higher online courses. The HS agreed, after reading the syllabus and understanding how JHU CTY grades the classes and transmits that information, that these classes could show on his transcript. So he took and did well on Linear Algebra last year, and is taking Multivariable Calculus this year. The JHY CTY math classes are no cake walk. The tests are, in my H's opinion and he's a math prof at USC who has taught these classes in the past, too long and rigorous than needed. Anyway, S survived it and his junior year.