AJHD study guide for the individual subject test in Science for the 2020 - 2021 Catholic Schools Academic Junior High Decathlon based on the book The Way Things Work Now. The study guide includes vocabulary, review questions, quizzes, diagrams, worksheets, and two 50-question multiple-choice practice tests. Access to Quizlet online classroom included. Answer keys included. Developed by the test writers for the 2020 - 2021 Academic Junior High Decathlon.study guide for the individual subject test in science.