Heres the link to the information that each group used for their presentations today:
https://docs.google.com/document/d/1V8JMyxR5derTh-2y-PP4gq6NiXl_wBJD8QHvktLMcKA/edit?hl=en&authkey=CLDDnoQH
Make sure that you have a rough idea of what each concept covers, as these could pop up as short answer questions in the exam that you don't want to miss out on.  Next lesson (wed. afternoon) we'll talk more about revision etc. but until then making sure that you're up to date would be a good way to spend time.