Oh no, that’s incredibly frustrating to hear about your MAS-II attempts! It sounds like you’ve put in a tremendous amount of effort, and that feeling of disconnect between practice and the actual exam is tough. I’ve heard similar feedback about TIA for other exams too – sometimes the depth just isn’t quite there. My Granny always said, “If you want something done right, do it yourself,” and it seems like diving deeper into the source material might be the “do it yourself” solution here, even with the lack of answer keys. Maybe focusing on understanding the derivations and underlying concepts will help bridge that gap. Good luck!