To remove a student from a specific group in a class on Microsoft Classroom, you need to do the following:

1. Sign into your Microsoft Classroom with your work / school credentials.
2. Go to the appropriate class.
3. Select 'Groups’ from the left side menu.
4. Select a group where the student is inside for which you want to remove a student.
5. Click on the three dots next to the student’s name.
6. Click on Remove from group.
7. Confirm when prompted.