I'm concerned about the type of questions I am getting on the 700+ questions available on the math. At first I was getting questions in the 550 - 700 range for a good portion, then 400 - 550, and now it's on the below 400 range with 169 questions left. This worries me because I believe the 700+ practice questions is adaptive. How does the practice bank work, is it the same bank for everyone or is it adaptive?