My teacher had us buy this book at the begining of the year, and she assigned problems from it, and is has been invaluable. The problems it gives are not your standard textbook plug-in-the formula questions. There are some of those, but most of the questions require some thinking and an actual understanding of Calculus. Even though I switched teachers, I still used the book to help review for tests, and it has worked great. This is a great buy for anyone who needs a supplement of questions to help study from during the school year for BC calculus. The only negative about the book is that it lacks detailed explanations. It only gives the answers and also gives a cross reference of questions by topics.