Also check out the assorted support at the school. I work at a community college (I'm 98% sure it's got a rad tech program) and they pay me full time to help students in the "pre-college skills" stuff because they've got to take a placement test, and more than 2/3 of the students (especially the ones who've been out of school for a bit) need at least one math brush-up course.
It's in the school's best interest to have successful graduates, and some schools have figured out that it's worht investing in their students. We've got a peer tutoring center and it's easy to form study groups with other students, and there are things like "chem 100" which is a brush-up course so you have the chem background for the bio courses. We've also got advisors and advocates to help people *find* the support (including financial) to get 'em through.
GO FOR IT