Hi there, I have (belatedly) discovered Notebooks and am finding these a great way to test myself across different levels and hone in on my weak points. I've added a load of lessons, but it feels like it's focussing very much on the higher level (B2) ones. I want to interleave my practice with my weak points from A2 and B1 too. 

Question: how does it decide which lessons to test from a notebook? Is it random? Or based on your current %? Or something else? 

Also, I'd LOVE a feature where it just quizzes you from your weakest lessons *of those you have already been quizzed on*, across all levels. Basically that's what I'm trying to achieve.