Score in a score is a term used to describe the act of achieving a perfect score on a test or exam. It is a rare occurrence, and is usually celebrated when it happens. The term is derived from the phrase 'score within a score, ' which is used to describe a situation where a person has achieved a perfect score on a test or exam. This phrase is often used to describe a situation where a student has achieved a perfect score on a test or exam, and is seen as a great accomplishment.