this page from the ALL ABOUT CIRCUITS website has a multitude of worksheets for the electronic diyer to learn from and test themselves with.
there is everything from AC, to DC, to FETs, opamps, filters, and BJTs. even such simple stuff as ohm's law and caps and resistors. seriously, everything from atoms to active circuits!
for example, here is one of their "design projects". the objective is to help you in designing tone control circuits.
with these worksheets, there should be no excuse not to have some serious kung fu!! hiiiiiieeeyahhh!!!!