In theory, if you passed Program Development last year you should know everything you ever need to know about C#. But in practice, things can slip from the memory over the long summer break!
This set of worksheets will bring you back back up to speed in C# and (in particular) object orientation. Not every student will need them, but as a general rule, the students who think they DON'T need them are generally the ones who DO need them!
Work though them in your own time: