Mcgraw sat books any good?

Test Preparation SAT Preparation
1

<p>Hi everyone,
I was wondering if any of you can suggest a very good SAT math book ( I score around 550s).
Is there any difference between
McGraw-Hill's Top 50 Skills for a Top Score: SAT Math by Brian Leaf</p>

<p>AND
McGraw-Hill's Conquering SAT Math, Third Edition [Paperback]
Robert Postman
Or maybe you can suggest a alternative. I heard Gruber pretty good ( but there are so many useless information and not enough tests.
I need a SAT math workbook that has through explanation. My family are poor so i can't tutor or many sat books.</p>

<p>Thanks</p>

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<p>Mcgraw SAT 2012 book works wonders if you are weak in math.</p>