Twelfth post-kindergarten year of school education in some school systems / From Wikipedia, the free encyclopedia
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Twelfth grade (also 12th grade or grade 12) is the twelfth year of formal or compulsory education. It is typically the final year of secondary school in most of the world. In most countries, students are usually between the ages of 17 and 18 years old. Some countries have a thirteenth grade, while other countries do not have a 12th grade/year at all.