Overlearning
Overlearning is when a student repeats the study of the material more times than is necessary to perfectly repeat the content from memory, as defined by Hermann Ebbinghaus.
Based on later findings in the 1900s and later, it is clear that overlearning only has any benefits for short-term memory retention. For long-term retention, Spaced repetition is one of the most efficient methods available, if not the most efficient one. Combined with the knowledge of the Forgetting Curve, it is easy to see how Spaced repetition can be an efficient method for long-term memory retention.