Is this book good?

I am taking the math II subject test this Saturday and I have been studying with this book, SAT II Success MATH 1C and 2C, 3rd ed (Arco Master the SAT Subject Test: Math Levels 1 & 2)
(That’s the name on Amazon). Does anyone know how accurate this book is to the real test? Also does anyone know where I can find good practice tests online?