At AC, we have some fantastically educated pilots. We have MD's, professional Engineers, MBA's, Lawyers, etc., but we also have those who have very little formal education past the High School level. One thing I have noticed though, is that most of the pilots at AC have a yearning for knowledge, and a great desire and aptitude to learn regardless of one's education level.
So, my advice to you, is to sign up for any continuing education courses that you can. It really matters not what the subject is. That way, at your interview, you can prove to the panel that you also desire to continually improve/educate yourself. Take mechanical courses that have some level of practical use, take art, languages, etc. Start filling in the educational void, or lapse since you finished your formal education. Volunteer for charitable organizations, etc. You want to present yourself in a way that the panel says " I can easily spend hours sitting with, and talking to this person, they are interesting, and have way more going on in their life besides flying ".
Good luck with your future endeavours.