Hi smash,
So is your whole class doing an assignment on the series? How amazing, but how is your teacher expecting you to study it if you haven't seen it? Did your class watch the series and you just missed the last episode? (Or am I missing the point and are you the teacher, not the student?)
Happy to help in any way if you need any background etc feel free to email me.
You can look at screenshots of the last episode, and read a full synopsis for the last episode here: http://one-summer.tv83.net/ep5solo.htm