Classify each of these as 'useful' vs 'not useful' when applying for college admissions:
GRE scores, SAT scores, dresses, prom dates, admission letter, recommendation letters, interview prep, networking, fees, headphones, number of friends, social media influencer

Useful: GRE scores, SAT scores, admission letter, recommendation letters, interview prep, networking, fees

Not useful: dresses, prom dates, headphones, number of friends, social media influencer score