Earn credits outside of school? highschool? Please read?

HI! Im in highschool and was wondering if its possible to earn credits outside of school? Not like online highschool, but to take extra cles, and earn credits for them.? I would like to learn another language ( either Japanese, Chinese, or Korean) though my school doesn't offer any of them. If I could prove that I have a certified teacher with a college degree,and that I showed up to a number of cles required and p a test in the end, do you think I could earn extra credits to graduate highschool?. When I went to registration, I asked the lady who was registering me and she said that is a good question, and something I should ask the Vice Principle, which I shall, soon. But do you think I should be able to earn credits this way? If this doesn't make sense, tell me and I'll try and rephrase it :) Thanks