The Compare Classes and Years page is particularly useful for heads of department. It allows them to view graphs and tables showing how much each class and year is using Educake. Access it from your My Educake page, here:

You'll see a comparison table of the number of questions answered correctly and the number of questions attempted for each year. The percentages correct are colour-coded according to the familiar stop light system. 

Click on a year to expand it and see the performance of each its classes, like this:

You can download the Compare Classes and Years data as a spreadsheet by clicking the purple "Download as a CSV" button in the lower right corner.