How many students are in the top 10%, 25%, etc.?

This depends on the number of students in the cohort.  If there are 100 students in 12th grade, then the 25 students with the highest GPA will make up the top 25%.  The number of students in the cohort can be found in the bottom right corner of a BISD high school transcript.  If there are 110 students, then 110 x .25 = 27.5 so 27 students would make up the top 25%.