As the title of the book implies, this is an essential skills practice workbook, and at the price, you are getting extreme bang for the buck. Problems are easy to understand without the need of pages of narritive couched in mathematician-speak. If you have had calculus before, you will very quickly regain your fluency. If you are just starting out, you will find the worked out problems and examples a real boost to getting the concepts in your class textbook.