I have two observations:
Don’t necessarily sign up for a community college during a gap year (if you decide to take one.) Many more merit scholarships from schools are awarded to freshmen than to transfer students, which is what you would be if you attend CC.
Regarding the math, take a deep breath. My D15 was also a year short of her dream school’s requirement – long story – so we contacted them. Everything else in her application was in great shape, so they let us know that she could be admitted and “make up” the extra class once she was enrolled. Once you narrow down your choices, call each admissions office and check. They might even waive the requirement, given your frequent moves.
Good luck!