1. I did a lot of questions in lots of 10, 20, 30, 50, 80, 100 in the "Timed Quizzes" section of the simulator. I got some wrong and reviewed the answers to learn from my mistakes. After a few days, in the "Timed Quizzes" area you can select "only questions i answered incorrectly".... so then all the questions I got wrong were asked again. This gave me a chance to re-read the questions and hopefully select the right answer as I had already studied and made notes about what I got wrong the first time. In general my scores hovered around 65-75% the 1st time and when I did the questions again, they increased to 84-87%
2. Yes all these types of questions come up either in the simulator exam questions or in the timed quizzes. They're fantastic practice.
3. as per item 1 - 65-75% and then 84-87% the second time around. I only did the "incorrectly answered questions" including incorrectly answered practice exam questions twice.
4. As above always between 65-75% - I don't think I got anything more than 75% in any of the mock exams the first time around.