It sounds to me like you need a good hack. If you're truly the type "c" procrastinator PG talks about then let's visualize this. This means your intellect is running on a higher level than the mundane circumstances around you. Would Einstein flunk out of high school because his mind was in neutron land while sitting through a lecture on some obscure part of history? He might, but that would be bad form. I strongly believe you should at least get a high school diploma (or GED equivalent), because it's too simple.

If you're on this board then you are likely entrepreneurial. You need to be able to analyze and solve problems. At the end of the day your teachers (now they are customers) need you to produce either a certain test score, or paper. Find a way to give them what they want, even if you have to hack it so that you're not doing all the tedious work yourself and/or simply test out of subjects.