Intelligence involves the ability to think, solve problems, analyze situations, and understand social values, customs, and norms. Intelligence is a general mental capability that involves the ability to reason, plan, think abstractly, comprehend ideas and language, and learn. Intellectual ability involves comprehension, understanding, and learning from experience. The objective of the study is to find out the intelligence of High School Students. Survey method was used for the study. 1,564 high school students from Madurai and Virudhunagar Districts were taken as sample using stratified random sampling technique. Raven's Standard Progressive matrices were used to measure the intelligence of high school students. Mean, Standard deviation, and t test were used to analyze the data. The results showed that there is significant difference in intelligence test scores of high school students in terms of area of study, gender, medium of instruction and board of school.