Purely from experience of several schools of the past few years, I have found that extra lessons at the end of the day actually detract from the day to day lessons. I have observed that students feel they can socialize and avoid work in regular lessons because they see the revision lesson, period 6/7 or whatever the school calls it as the real revision lesson. I watch schools in a panic essentially forcing teachers to run these classes and demanding students attend. I have always thought that if they simply did what was asked in class there would be no need for any extra sessions. I feel that this approach dilutes the learning, rather than enhances it. Is it just me?