(the data) is ordered too by id_number. which is exactly what it should be like, BUT I need to somehow sort this incomming data by college.

Let the database do the work.

$sql = <<SQL;
SELECT DISTINCT
  student_id,
  student_name,
  student_address,
  student_gpa,
  college
FROM school
WHERE minor = 'CS'
ORDER BY college, student_id
SQL
[download]

All you need do then is recognize when "college" changes.