Final answer:
I would prescribe methylphenidate to the college student to improve focus and reduce impulsivity.
Step-by-step explanation:
The medication that I would prescribe for a 20-year-old college student who is concerned about his grades, struggles with focus and has low energy levels would be methylphenidate. Methylphenidate is a stimulant medication that is commonly used to treat attention deficit hyperactivity disorder (ADHD). It can help improve focus, increase alertness, and reduce impulsivity. However, it is essential to consult with a healthcare professional to determine the appropriate dosage and monitor any potential side effects.