Unit tests are given to test knowledge of the subject matter on varying levels of comprehension. So, some questions will be simple 'what are' or 'who are' questions such as: Who is Letitia Blacklock? So, to study for the test, you should review all of the characters (at least the major characters). Then, questions could be asked about themes, and the plot line. However, for more complicated, higher level questions, a unit test could ask larger, extended essay type questions such as: How did you feel about the ending of the story? or At what point did you decide that Charlotte was the killer? What gave it away? Would you have done something different? Why or why not?