One I worked with was more of a finishing school than a 'how to be a model' school. All of the ones I have seen are better at teaching their model wannabes how to look and move well in public rather than how to work in front of a camera or on a cat walk. The only way you will learn to model is to get in front of the camera. Now with that said, here is how I am view the current state of the modeling school market. Many of the modeling schools around are franchise operations.
Local operators buys into a franchise just like a hamburger joint.
They may have no experience in the modeling industry, but after putting down a good chunk of change, they are now experts teaching classes. Chain operations include Barbizon Modeling Schools, John Casablancan Modeling, John Robert Powers Modeling and there are others. These chain schools can vary in quality just as independent schools can. Some operators do have extensive knowledge of the industry and can give students good insight into the industry - many don't. A few of these school's students, and I do mean a very few, may even go on to a career in modeling.