Your ACT score is not going to impress top schools. It’s in the 92nd percentile. Your background is very unusual and it’s hard to say if they would be willing to overlook the ACT. I’m guessing most will not.
Some schools will accept credits from other colleges, others will just accept AP. If credit isn’t given, in most cases you could get placement. I don’t know any school that would force you to take calculus if you’ve already done that, provided that you have an acceptable AP or placement test score. You’ll need to check policies on each school you apply to. But you should keep in mind that the coursework you have completed may not be as rigorous as the comparable courses at a school like Stanford.
Can you give us some idea of what coursework you have done? For instance, you mentioned calc1,2,3. Roughly 20% of incoming STEM freshmen at top schools will have this coursework also. Have you done much beyond this?
And if you spend only a year or two in college whereas they spend 3-4 complete with research projects and multiple internships, it may be difficult to compete for admission to a top grad school like Stanford.
Yes, some schools will do a 4 year masters program for students entering with sufficient credits. Look into that.