They told us that starting at pre-calc wouldn’t be a problem and looking at their catalog it seems that trig is a pre-req to all their advanced math courses. My son is currently doing an algebra 2 class that doesn’t include trig (Art of Problem Solving Intermediate Algebra) so that seems appropriate.
Middlesex now offers some interesting looking semester math courses in modeling and coding/algorithms so I hope there would be enough to fill out his 4 years. His safety schools he’d wind up having to do independent study in math for 1 or 2 years.