I'm curious about something from the test. On the differences section, after you put in your answer a new number would pop up immediately. So did you guys try to do these as fast and accurate as possible and solve more? Did it stop after a set number of problems or was there a timer? I thought it felt like it lasted 2 minutes or so, and I tried to solve as many as I could in that time. But I'm not sure if that will help my score at all.