How can one regain the ability to memorize and achieve academic success after years of中断 (interruption) and losing desire and determination?

For excellence and memorization to return, the heart must be emptied of desires, then one must consistently review lessons promptly, read the lesson before attending it, pay attention to the teacher during explanations, and review lessons on the same day. This requires effort and patience. The poet said: "Strive with a strong, unfailing resolve; if one knew the value of knowledge, one would not sleep."