If all teachers were doing their jobs right there would be little need for Grind Schools & Christmas & Easter Revision courses etc, unfortunately I cannot see unions ever agreeing to teachers being rated. A lot of it boils down to having a good principle who expects high standards from his teachers.
I couldn't disagree more. As has already be pointed out, there is a perception that if one pays for something then it is inherently better than something given gratis. Regardless of the school there will always be students who are taking grinds such is the points pressure for some courses. Boards.ie have some very insightful comments from students who attend some of the well known grind schools.
There are no/few discipline issues in the grinds schools because (a) most of the students are motivated to go there, (b) any infringement can result in expulsion, (c) Mammy/Daddy are paying through the nose.