Final answer:
The study suggestion that is NOT recommended is cramming, as it is less effective for long-term retention compared to distributed practice, self-testing, and interleaved practice.
Step-by-step explanation:
The student's question pertains to research-based suggestions for studying more effectively, as presented in a feature in their psychology textbook. Among the given options, which include a) Distributed practice, b) Cramming, c) Self-testing, and d) Interleaved practice, the option that is NOT one of the suggestions for studying more effectively is Cramming.
Effective study recommendations often emphasize methods like Distributed Practice, where you study across several sessions; Self-Testing, involving testing yourself to check your knowledge; and Interleaved Practice, where you mix different kinds of problems or subjects in one study session. Cramming, on the other hand, is not recommended because it can overwhelm the brain and often leads to a lack of long-term retention of the material.