I found it very enjoyable and effective to go thru the exercises. The author has a way of describing the tricks that makes you want to apply them and have a great idea how to do so -- and it works.<br><br>Some of the chapters seemed superfluous, not really focused on the math stuff. I could have used even more practice -- as it is, I repeatedly went thru the same exercises to maximize my speed.<br><br>I think this could be enough to help someone's psychology into thinking they had become a math whiz -- and that's what being a whiz is, largely a matter of attitude!<br><br>This is also an effective book to read for a distraction; it's different enough from most people's concerns that someone angry or depressed or whatever might find this a great relief.