Eighth grade
Educational year
From Wikipedia, the free encyclopedia
Eighth grade (also 8th grade or Grade 8) is the eighth year of formal or compulsory education in the United States. The eighth grade is the third or fourth (and typically final) year of middle school. Students in eighth grade are usually 13–14 years old. Different terms and numbers are used in other parts of the world.

Brazil
In Brazil, Grade 8 (8º Ano or 8ª Série) is the third year of middle school. It is the oitavo ano do Ensino Fundamental II.
Canada
In Canada, it is equivalent to that of the United States.
United Kingdom
In the United Kingdom, Year 9 is the educational year group equivalent, and the last year in Key Stage 3 development. Year 9 is used in England, Scotland, Wales, Australia and New Zealand. It is the tenth or eleventh year of compulsory education.[1]