The Puerto Rico Department of Education (PRDE) measures the academic achievement of students through the standardized test Measurement and Evaluation for the Academic Transformation of Puerto Rico, hereinafter META-PR (for its acronym in Spanish). The test is aligned with the content standards and grade expectations approved by the agency and measures the mastery of content in Spanish, Mathematics, English as a second language, and Science subjects. All 3rd, 4th, 5th, 6th, 7th, 8th and 11th students participate, except in Science, which is administered in 4th, 8th and 11th only. There are two modalities of the test: the regular one (META-PR Regular), for students in the regular program, and the alternate one (META-PR Alternate), for students with significant cognitive impairments.

Proficiency is defined as the number of students who obtained a proficient or advanced level of performance. When calculating proficiency, students of both modalities are considered. Students identify themselves in one of the following 4 levels: pre-basic, basic, proficient, and advanced. The proficiency percentage measures the number of students who obtained a proficient or advanced level of performance on the tests by the total number of students who took the test and obtained a valid score. In compliance with the PRDE Consolidated Plan or ESSA Plan, short and long-term proficiency goals were established according to the required subgroups. These goals are presented in the graphs that include information about the subgroups.

To protect the identity of the participants, the figure is omitted when the minimum number of 10 students is not reached in a subgroup. If the values do not necessarily add up to 100%, it is because the data was rounded to the nearest whole number.