Not bad. Xueba Notes is a brand of Green Card Education. It combines comics with notes, integrates entertainment elements and knowledge into teaching AIDS, and is vivid. There are comprehensive knowledge points in mathematics, summaries of various formulas and knowledge charts to help you remember. At the same time, leave each page blank and you can record your own notes. This book is a teaching aid to help you remember knowledge points, suitable for students who are unfamiliar with knowledge points.