Stalla or Schewser Qbank?

I used Schewser for qbank for LI and LII last year and was ill prepared for LII. It was a great tool for LI. I make the mistake or relying too much on questions when in fact the test is more of problem solving and found it challenging to determine where to find the relevant Variables to solve the problem. The Qbank gives you the variable. The best samples are in the CFAI books. I think the qbank has value, but not nearly as much as in level 1. What are your thoughts about the stalla qbank or any other product?

I feel that the best source is end of chapter questions in the curriculum.