What would you say is the hardest CSWA Prep problem?

Not so much a technical question as much a question for the users. If you did get your CSWA and used the practice problem database, what'd you think the worst problem was?https://www.solidworks.com/solution/education/practice-problemsFor me, it was 10.1. I hadn't made my own planes before that so I kept banging my head against the wall.