Almost a quarter of a million students take SAT Subject Tests (previously known as the College Board Achievement Tests) every year. Many colleges require SAT II Subject Test scores. The purpose of these tests is to measure and demonstrate your knowledge and/or skills in specific subjects and to test your ability to apply that knowledge on each particular examination. The better your score is, the better your application will look to the colleges of your choice.If you're reading this book, it's likely that you are preparing for one of the SAT II Biology exams. We have tried to make this a"workable" book. In other words, the book is set up so that, regardless of the level exam you're taking, you will be able to find the material necessary to study and to take those tests that are most applicable to your level.Divided into sections, the book begins with a diagnostic biology exam. The purpose of this diagnostic test is to help you get a handle on what you know and what needs more work. Take this exam (and all of the tests) under simulated exam conditions, if you can. What this means is that you should find a quiet place in which to work, set up a clock, and take the test without stopping. When you are finished, take a break and then go back and check your answers. Always reread those questions you got wrong since sometimes an error can come from merely misreading the question. Again, double-check your answers, and if they're still not clear, read the appropriate section in the review material.Once you've completed your Diagnostic Test, it's time to move on to the biology review section. Study the material carefully, but feel free to skim those portions of the review section that are easiest for you.Then, take the Practice Tests. There are three simulated exams designed to give you a broad spectrum of question-types, similar to those you will find on the actual SAT II Biology test. We suggest that regardless of whether you plan to take the E (ecological) or M (molecular) version of the test, it would be extremely helpful to take all of the tests in the book. In this way, you will have a much broader perspective of the exam and may even surprise yourself as to how much you actually know about each level.As you complete each exam, take some time to review your answers. We think you'll find a marked improvement as you work through the Diagnostic Test and complete all of the full-length practice tests. Always take the time to check the review section for clarification, and if you still don't understand the material, go to your teacher for help.The Biology E/M test contains 60 general biology questions followed by 20 questions in each of the special sections: Biology E or Biology M. You can select the area in which you feel most confident, and, after completing the 60 core questions, you can then take either the Ecological or Molecular sections. That selection can be made when you take the test by filling in the appropriate code for the section you wish to take. You cannot take both sections on the same test date.