Think of this as a textbook entry from your own personal knowledge. What is important from this unit? How can you use this website to show that? Including activities from class is a great idea. Are there any pictures or youtube videos you could that would help you explain tougher concepts? your audience is someone who is looking to study for the unit test. I understand this was sprung on you with very little notice, so let;s just worry about making the next one better. The simplest way to do this is think of each learning target as as section on the page and then use the space to explain each one. Ask yourself, "What would I want on a webpage if I needed to Review/Relearn everything from this unit?"