Multiple regression analysis indicates that the Reading-Level Indicator, a paper-and-pencil test, is a moderately strong predictor for the high-stakes standardized test, the Florida Comprehensive Achievement Test in Reading. Classroom teachers can administer the inexpensive Reading-Level Indicator in a short period of time and use the results as a tool to identify students who need extra preparation before high-stakes tests. Assigning students to differentiated instructional groups based on Reading-Level Indicator scores could be an effective strategy for improving high-stakes test scores. (Contains 5 tables and 2 figures.)