It translates to nothing, and so does any score that you get from the Official SAT Study Guide. It all depends on how well you know the material in the test that you end up taking at the test center. The reason is that when you actually take the test, you won't remember or utilize any of the questions that you answered from your practice book at home. You will use your reasoning skills and any tricks you picked up on by taking firsthand material (actual SAT exams). That being said, the best way to prep is to actually take the test. The second best material is the book that you are waiting to arrive and any other material that came from the College Board (SAT questions of the day, released exams from the past, etc.)
You would have to understand how the SAT works in order to figure out how the Barron's book is helping you. How is it contributing to your knowledge and your reasoning skills (this is in terms of the SAT, not the Barron's book)? What you should do is simply take the first test, order the Q&A booklet (which has answers to the test), and use it to try to understand how you answered the questions and why they are wrong.