It means that the last person that got in the top 100 has 74 points. However, there are cases that there are multiple people with the same number of points. So they take the one who applied the earliest. The waitlist are alternates. They take 100 people, 60 that are for sure in, and 40 alternates. The alternates replaces people who decides not to go to the program, or fails within the first semester.