What is Group in Edu Expression Pro version ?
Group is container to categorize students. You can consider group as Batches or Courses or any division you use for your students.
For Example, if you are having two courses like Engineering and Medicine (You can create group based on the courses) or some institute has groups based on sessions, languages etc. (English Group, Spanish Group Etc. )
How Groups are Useful?
For Example you have two courses 1. Medicine and 2. Engineering. And Chemistry is the common subject. So when you are creating an Exam for Chemistry for Engineering Group, you can create question, subject and Exam assigning Engineering group only. The medicine student, teacher will not have access to this content anywhere.