I just wanted to say that I really like the Progress(Beta) Tab.
Maybe it's just that I never thought to set specific enough goals, but before, I was just randomly studying the level that the test placed me into, and retesting once in a while to see my progress. I didn't really mark lessons as "studied."
But the progress tab made it "click" that I could set a goal for a certain number of lessons at a level, which gave me more motivation to check off lessons and I've been progressing much more.
Thanks for the great feature!