Here's an official study guide that can be helpful. Read the explanation of the test and study tips carefully. Get familiar with each section before starting with any exercise or practice test. When starting, you can take a practice test just to give you an idea of your current abilities.
The book contains photocopies of Jefferson’s original letters. Not only are these letters Jefferson’s actual words, but the copies also present his words in his own handwriting. While the page isn’t the actual letter, Jacob is quoting Jefferson’s actual words and thoughts. Therefore, the book is a primary source document.