Ask the teacher for the ISBN (they'll know what this is). School Shakespeare texts have fab notes in them, an introduction and usually have a section in the back which helps to answer most essay, controlled assessment and exam questions set.
If you're really struggling, sparknotes do line by line translations.
If you want a new way to enjoy the story, other than the various film versions or a trip to the theatre, try searching Manga Shakespeare. This one from Julius Caesar is superb, and includes only Shakespearean text. Not for C grade students I think, but a way for keen, B-A* students to enjoy the text. The front two pages are colour, introducing the characters. The rest is black and white ink drawings, which are stylish and hugely evocative.