Hi @redLamps !
I’m also a high school junior who was accelerated in mathematics. I just finished Linear Algebra, Differential Equations, Multivariable Calculus and (College) Statistics this past year.
I can’t comment on how these specific courses will look to colleges (I would presume they seem pretty impressive to adcoms), but I do know that selective institutions prefer applicants that have taken 4 years of mathematics.
Regarding the subject matter of the courses, I would say that (especially if you go into econ) they will be relevant. For example, many of the linear models for systems of equations that we studied in linear algebra have important applications to economics. Multivariable calculus probably won’t be as useful, but is definitely helpful to have under your belt for studying certain economic models (e. g. Cobb-Douglass production func).
Given that you scored a 5 on the AP Calc BC test (and, extrapolating from that, probably did fairly well in the class itself), linear algebra and ESPECIALLY multivariable calc won’t be very difficult for you (trust me, I know 
).
Best of luck with your decision!
Aryakhan81