You will be starting with the CRJ 200, not the 700. And honestly, I would not recommend studying systems at all before class. Some people will disagree with me, but I believe that "primacy" is a real thing, and learning something incorrectly on your own will hurt you more than any advantage you would get by starting early. You will have more than enough time during system classes and IPT's to learn the systems the way that they want you to know systems. The CRJ200 book by Aaron Boone is great for studying after class, but not before it. It is MUCH more detailed than you will be required to know, but it is a great book.

Spend your time on the study packet that they sent you. Know the memory items and the limitations. Memorize the memory items VERBATIM. It must truly be word for word.

The thing that gives the most people trouble during the limitations test is the icing definitions and when anti-icing must be turned on. The limitations test is a 5 page fill in the blank and short answer type of test. You will need to write the icing definitions and required usage as close to what is listed on the limitations test as is humanly possible.

With that said, you will have at least 4 days during indoc to review these individually and as a class. You are given a blank test the first day to take home and fill out. You then review this each day until the test day.

And...once you are in ground school, study. Spend nights and weekends in the hotel lobby in study groups, or at the training center in a briefing room or class room. The training center is open to you 24 hours a day. Use it.