Classroom teachers are critical in providing qualitative and quantitative data about a student's performance within the classroom. As the curriculum experts, teachers can provide a body of evidence of students working above their same-age peers. Evidence of exceptionality is above the 95th percentile while high abilities are below this level. An example of this might be a sixth-grade student who has already demonstrated masterly of seventh and eighth-grade math standards and has successfully completed all the geometry modules from an online math program. Advanced classroom performance must be measured through examples of above grade-level work. Earning an "A" in a class does not necessarily indicate exceptional performance. Grades lack standardization and are influenced significantly by students' motivation, classroom behavior, personal appearance, and study habits.