So during the semester I did Qbank practice qs in my weaker subjects. I've done 25% of qbank, but I've done all the questions for a 3 or 4 subjects, with lots of questions for the other subjects remaining. My question is- how should I practice randomized blocks? Should I buy another practice question program (usmleworld) or just do randomized blocks with my questions I got wrong in the past? Thanks for any advice.