From the beginning of the year up until the end of October, learn the content that your teacher tells you to. Buy the Barron's AP Biology prep book, and become familiar with its structure. Read Chapter 1: About the Exam and Chapter 20: Learn How the College Board Grades Your Essay in the Barron's book and briefly look over the content of the book.  By the end of this time, you should be ready to review information already covered in your class at the beginning of the year.

Read Chapter 2: Biochemistry, Chapter 3: The Cell, and Chapter 4: Cell Cycle in the Barron's book.  DO NOT complete the quizzes after these chapters; these will be completed at a later time.  If you would like, you can purchase Barron's AP Biology Flash Cards as another study resource and use them to review as well, or you can even make your own to personalize them.

Read Chapter 5: Energy, Metabolism, and Enzymes, Chapter 6: Cell Respiration, and Chapter 7: Photosynthesis in the Barron's book.  DO NOT complete the quizzes after these chapters; these will be completed at a later time.  Review Chapters 2-4. Take your first full practice AP exam in this book or from a different source. Time yourself appropriately. You will not do very well because you have only studied about half the material so far, but use this as an opportunity to learn about the structure of the exam and the type of questions asked. Focus on the parts of the exam that you have learned about to be able to gauge your review time.

Read Chapter 8: Heredity and Chapter 9: The Molecular Basis of Inheritance in the Barron's book.  DO NOT complete the quizzes after these chapters; these will be completed at a later time.  Review Chapters 5-7.

Read Chapter 10: Biological Diversity, Chapter 11: Evolution, and Chapter 12: Plants in the Barron's book.  DO NOT complete the quizzes after these chapters; these will be completed at a later time.  Review Chapters 2-9.

Read Chapter 13: Human Physiology, Chapter 14: Endocrine and Nervous Systems, Chapter 15: The Human Immune System, and Chapter 16: Animal Reproduction and Development in the Barron's book.  DO NOT complete the quizzes after these chapters; these will be completed at a later time.  Review Chapters 2-12.  Take the quizzes for Chapters 2-9.

Read Chapter 17: Ecology, Chapter 18: Animal Behavior, and Chapter 19: Investigations in the Barron's book.  Review Chapters 2-16.  Take the quizzes for Chapters 10-19.  Take and score the first practice AP exam.

In the first week, take and score the second AP exam in the Barron's book.  In the second week, take and score the sample AP exam that the College Board provides.