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fifth grade

n. (context US education English) The period in school that comes after fourth grade and before sixth grade.

Wikipedia
Fifth grade

Fifth grade (called Grade 5 in some regions) is a year of education in many nations. The fifth grade is the fifth school year of elementary school. Students are usually 10–11 years old. Depending on the school district, the grade may be in one of the following scenarios: the second to last year or the final year of elementary school, the first year of middle school, the first year of intermediate school, or none of those. Also, in other schools Grade 4 and 5 are one school. In Asian countries like India, fifth grade education is also known as 'class 5' which is usually the last grade of the primary education system.