<p>I heard great things about this book, however, I've just started to use it and it seems ridiculously easy. I scored 510 Math my first try, and am now studying to bump it up to at least 600 (preferably 660). As bad as my score was, I got through all of the 101 Math Questions without difficulty, have just started onto the fractions bit, and am wondering if this is supposed to be helping me. I know how to add fractions, change denominators, convert mixed/irregular fractions, and deal with complex fractions. Will it get harder as it goes along or something?</p>
<p>Any experience with Gruber's?</p>