Spotlight Quick Revision Biology Form 3 and 4 has been uniquely designed to assist students quickly revise Biology topics taught at these levels. It is also intended to help candidates revising for their KCSE Biology Paper 231/1,23112 and 23 I /3.The book is also essential for teachers in the preparation of evaluation materials like Continuous Assessment Tests, End-of-Term and End-of-Year examinations. The book is well illustrated to help learners concretise contents taught at these levels.This book is presented in a clear, simple and precise language that makes revision stimulating and interesting. It covers all the 8 units taught in Form 3 and 4.    The structure of the book is as follows:  There are four units covering the entire Form 3 Syllabus and four other units covering the entire Form 4 Syllabus. Each unit has brief revision notes in bullet form spotlighting the key points per unit.  Point-checks and notes have been provided at various instances to guide and appropriately explain concepts at hand to students. Practice Exercises have been included to guide learners on how to effectively answer questions.  Comprehensive Revision Exercises have been given at the end of every unit. 8 KCSE ModelTest Papers covering Paper 23 111  and 231/2 and 3 KCSE Model Test Papers covering Paper 231/3 have been provided to facilitate revision of all topics taught from Form One to Form Four.  Answers to all Revision Exercises and KCSE Model Test Papers are provided at the back pages of the book to help learners and teachers in the process of revision and evaluation respectively.