As a teacher in a school that didn't come up with great results on the MySchool website I have a question for you to consider (although they may not be relevant to your school).

What is the size of your school? - I ask this as I teach at a very small school with only about 15ish kids taking the test at each year level. Therefore, only one or two kids doing not so great puts a great dip in our results. Added to that we have a couple of special classes at our school (with some parents wanting them to take the test - thus making our results look even lower).

That being said, the school offering to do after school classes AND suggesting you pay for them isn't right in my opinion, especially if it is a direct response the the MySchool website (i.e. to try to improve their results to make them look better). If they are offering it like a tutoring service and would have done it without the results then maybe......but the timing of it looks really suspicious!!