Final answer:
The answer to the student's question is elaborative rehearsal. This method involves linking new and challenging information to existing knowledge, aiding in its memorization and long-term retention.
Step-by-step explanation:
Devoting more time to memorizing more challenging info for an exam and skimming over less challenging info is an example of elaborative rehearsal. Elaborative rehearsal is a technique where new information is linked to existing knowledge, making it more meaningful and easier to remember. This involves deep and meaningful processing of information, supporting its transfer from short-term to long-term memory. In contrast to shallow processing, which might involve mere repetition or surface-level engagement with the material, elaborative rehearsal ensures a deeper understanding, aiding like long-term retention and recall.