The A-Level Chemistry textbook offers in-depth coverage, detailed explanations, and comprehensive practice questions, making it ideal for deep understanding and long-term study. In contrast, the CGP Chemistry Revision Guide provides concise summaries, simplified explanations, and quick practice, which are excellent for quick revision and reinforcing key concepts closer to exams. Using both resources together is the most effective approach: start with the textbook for foundational learning, and then use the CGP guide for focused, exam-oriented revision.