Final answer:
Revision is needed for reinforcement, to prevent memory decay, and to aid in information retrieval during tasks such as exams.
Step-by-step explanation:
Revision is necessary even if the encoding of information was 95% successful primarily for reinforcement. Despite a high level of initial encoding success, information may fade over time without reinforcement. Revision serves to strengthen memory traces and aid retrieval processes. It's similar to how we learn new skills, such as driving a car, with effortful processing, which requires attention and effort at first. Over time, and with practice, this information can be encoded more automatically. However, without revision, the details may not be as readily accessible when needed, such as during an exam. Additionally, revision helps with shaping our behaviours by rewarding steps towards mastering the material.