Students of Senior High Schools frequently encounter difficulties when solving mathematical problems. The Author's principal concern has been clarity and simplicity in dealing with all the topics. This book covers the Senior High School syllabus in Core Mathematics and the student has been provided, after each topic, with model questions and solutions in a manner comprehensible to any average student. Attention has also been paid to every detail in providing a solution that conforms to marking schemes of examining bodies' world wide. This Book is self explanatory and needs minimum or no supervision in order to understand the concept underlying each topic and contains many examples that are all standard questions. No room has been provided for irrelevant topics or materials to further complicate the plight of the weakest student of Mathematics. Any serious student, who makes and attempt to work through all the problems, using the model solutions as a guide, is assured of success in all Senior High School final examinations and further examinations. It is my fond hope that both the instructors and students who use this book will find it fulfilling and also hope that the book will help stimulate interest in the study of Mathematics.