Why do you want to skip highschool just to get a less than average diploma? I'm 19 and still in hs, I could easily take the GED and get out of here, but I'd rather finish and excercise my mind.
I'm not arguing with that. But you need to ask yourself; if this is from God, then why is it fluctuating? Be sure you know if it's spiritual or just emotional high. The two can often feel similar.