A thorough knowledge of probability and linear algebra is a pre-requisite for this class. Here are some basic probability and linear algebra resources to help you jog your memory:
An excellent resource on probability is the online textbook by Grinstead and Snell. I would recommend reviewing Chapters 1, 4 (for conditional probability), and 6.1 (for expectations).
Some topics in linear algebra and links to resources on them are below: