A lot of (community) colleges do placement test, in my experience. I tested out of all my mathematics courses.

I did this. I'm starting in my final semester this fall, after going back for my degree at 38 and 8 years experience in my field. For my field, "testing out" wasn't an actual test, it was displaying to the professor that I could show that I had done work very similar to the curriculum for that class and could speak the jargon of my field. They only let me out of a couple requirements though, and only made it so that I didn't have to take those classes, no credit was given to me. Mostly, my experience has led to me having a serious foot up in a lot of my classes and being able to act as an unofficial TA in some of the hands on classes. And for the classes I really should have been allowed to test out of, I still generally learned enough new material to consider it worth my time and money.

If you have a specific institution in mind you’d like to attend, you’ll need to talk with some combination of their admissions, advising, and testing center staff.

CLEP exams let you test out of basic courses and get the course credits without taking the class. I did three classes that way a few years ago. I'd still recommend studying since the tests cover specific material. They're not general knowledge/life experience exams, but you can study at your own pace and test out when you're ready. clep.collegeboard.org

I'm pretty sure this is different at different schools, you're going to have to ask. At my Uni (in the 90s) you could "challenge" 100 and 200 level courses for full credit. The prof had a bit of leeway on when, in the term, the test was offered and whether you'd be excused from attendance until then.

It was easier, in my case, to sign up for the same course at the local community college (which didn't have any attendance requirements) for $30/credit (again in the 90s), just show up for tests, and then transfer the credits.

What others have said - every school is different and you need to talk to an advisor. When i was in college (100 years ago) we took CLEP tests for specific classes that got you credit. My kids took AP exams and it was totally different at their school-if they passed a math AP they got 3 hours credit, but it was counted as a 'math for non-math/science majors' so there was no real way to test out of those.

I suggest you look at WGU. Fully online and is competency based. That means that you can just pass any class without doing homework and such—just do whatever the required tasks are to complete the course and you’re done and with credit.

Why go to college if you aren't going to take the classes?

Talk to the advisors at the college.