I'm a big fan of the Problem of the Week posts and have learnt so much from them. To test myself I created a viewer where I could replay each position until I get them right. I've called it BG Test and I have put it online for everyone to use. You can find it
here. Please go ahead and try it out. It's not finished yet but I would appreciate any feedback, good or bad. The idea is that you can keep testing yourself on positions until you stop making errors. Also, you can easily go to the lessons that you need to review.
Hope you enjoy.