Feedback on Dr. Chung's SAT Math book

<p>Has anyone's score significantly improved by using this book?
I took 3 practice tests and I'm scoring in the 610-680 range, but on actual College Board BB math tests, I'm scoring around 720. Scoring so low on Dr. Chung's tests discourages me from even trying because I feel like I haven't made any progress at all. </p>

<p>Should I continue using Dr Chung's book or is it just a waste of time?
I want to try to get a 750+ on the Oct SAT, so I need to utilize the last 2 weeks as efficiently as possible.
Thanks!</p>

<p>I haven’t specifically used Dr. Chung’s SAT 1 book, but I used his book for the Math Level 2 test. </p>

<p>His tests are significantly harder- don’t get discouraged. Learn from your mistakes and continue to practice. The real test will seem easy.</p>

<p>thanks! I won’t give up because Jason Mraz says not to c:</p>