You can use older PTs for drills. And do some 60s,70s,80s. When you don't feel confident with your fundamentals, use older PTs to practice. They're more cookiecutter and they can help you see the pattern more easily.
Hey! It's great that you've identified the patterns in the questions you miss. It'll be helpful to create Problem Sets of those questions and drill them. I'm doing drills now and they're helpful to see the patterns in the cookiecutter answers too.