Organic chemistry
This large text book covers a two-semester course in introductory organic chemistry. I did well in this course, and one contributing factor was the high quality of this book. The author understands that studying organic chemistry requires a lot of practice. There are dozens of problems accompanying each chapter. Some are within chapters, which helps you to understand what you are reading, and the challenging problems are at the ends of chapters. To tie your studies to the real world, there's a section in each chapter concerning a well-known chemical, drug, or family of organic molecules.