This booklet presents ideas for utilizing standardized reading tests and an informal inventory to determine the reading levels of secondary school students. Comprehensive reviews of the most commonly used standardized tests for high school students and information about their construction, standardization, administration, and use make up the bulk of the text. The rest of the book deals with the criteria used in reviewing the tests and a short chapter detailing how to select a reading achievement test. The book is intended primarily for classroom teachers and other personnel directly concerned with selecting reading achievement tests; information is thus not presented in highly technical or statistical terms. (TO)