This series is designed for students preparing for selective admission into key high schools through independent enrollment programs and strong foundation tracks. Its content is closely aligned with the level and style of mathematical competition problems.It systematically organizes key concepts, axioms, theorems, corollaries, and advanced problems in geometry, primarily based on middle school mathematics but extending to competition-level depth. The book emphasizes visual reasoning and problem-solving, with most questions presented through geometric figures and minimal explanatory text. To use this book effectively:Study the section "Figure Explanations" carefully.;Attempt to understand selected figures independently.;Refer to "Questions and Brief Solutions" to verify understanding.;Build mastery through repeated practice with a range of figures.;This book is intended for students with strong mathematical ability and is comparable in difficulty to problems found in high school independent enrollment examinations and mathematics competition-style assessments.