Just work through the courses yourself on sites like MIT OCW, edx, Coursera, etc. You can also buy books like Morin's problem books. And you could always emai

Just work through the courses yourself on sites like MIT OCW, edx, Coursera, etc. You can also buy books like Morin's problem books. And you could always email professors at a local university about auditing courses if you really want in-person instruction, but it's really not necessary, especially if you're only interested in classical physics.