Only Florida, Maryland, and New York require adults who are new drivers to take any kind of class/instruction. (Most states require it under 18, with a few under 21 or 25.) Everywhere else you can just walk in and take the test.
The perhaps greater problem though is that those tests are completely trivial.
Florida is a declaration of experience for minors and nothing(?) for adults except a (computer) knowledge exam. If you turn 18, you can go and sit the knowledge exam and do a lap round the DMV.
For kids, it's 50 hours of road experience, and 10 at night, but a parent can sign that off. Maryland looks the same? You've got to do a knowledge test to get a learner's permit, 6 hours behind the wheel + 30 class, and then you get a provisional which can be upgraded to full. NY is also a 50/15 hour parent declaration and maybe(?) a supervised course for a few hours.
The perhaps greater problem though is that those tests are completely trivial.