im also learning theory by myself, learning grade 3 at the moment. haven't taken any exams yet though. This would be my first so I'm preparing myself extra.
and i bought the AB Theory In Practice Book, as well as the other AB theory books I could learn from. The First Steps to Music Theory and the AB Guide to Theory.
I'm pretty good in the theory stuff, except for note groupings but I couldn't check my answers.
I found this really helpful (about the Theory Time book).
I think I might buy it real soon.
Thanks MUCH