Key Stage 3 (KS3) is an educational stage in the United Kingdom that typically includes students aged 11 to 14 years. It covers Years 7 to 9 and is part of the National Curriculum. During this stage, students study a range of subjects, including English, Mathematics, Science, and History, to build a strong foundation for their future education. At the end of Key Stage 3, students usually take assessments to evaluate their progress. The knowledge and skills gained during KS3 prepare students for Key Stage 4, where they will begin their General Certificate of Secondary Education (GCSE) courses.