She was one of nearly 19,000 students from 84 countries Washington: Natasha Peri, an 11-year-old Indian-American girl has been judged as one of the brightest students in the world by a top US university for her exceptional performance in the SAT and ACT standardised tests. Both the Scholastic Assessment Test (SAT) and American College Testing (ACT) are standardised tests that many colleges use to determine whether to accept a student for admission. In some cases, companies and non-profits also use these scores to award merit-based scholarships. All colleges require students to take either the SAT or the ACT and submit their scores to their prospective universities.