Well, am a college student and i had never be good at math. I was having some problems in understanding some exercises so my teacher mentioned about this book and i can say that it helped me a lot to understand and do well on the course. Right now i'm still taking math courses (advanced algreba) and i refer to this great book when i forget something. I strongly recommend this book to everyone who is looking to improve their skills, have more practice or understand better. This book is great tool.