Really helpful and informative. If you're taking calculus 1 (business application) right now, this book can be a good choice for you. It covers not all, but most problems you might have on the tests and it provides lots of questions for practice. However, it would be better if it had more advanced questions, which required a deeper understanding of the topics. Because literally, calculus is a tough course and the exam is not only about the basic questions. Good luck everyone!