You cannot “develop a hook” other than a recruited athlete or perhaps an outstanding special talent: musician, writier etc…
Here some hooks that schools look for in admissions:
Alumni connections
Don’t assume that you’re a shoo-in just because your mom or dad went to your dream school, but you can expect that your folder will be reviewed very carefully. If you’re denied for any reason, the decision will be painful for the college.
Athletics
Playing a sport can give you an excellent boost come admissions decision time. If you’re a superstar you can earn a full scholarship, but even a less exceptional track record can up the odds for your college acceptance. However, some students (and parents) overestimate the weight that athletic ability carries in the admission process and expect an athletic scholarship to be their financial saving grace. Don’t assume you’re getting an award until you get one.
Ethnicity
Colleges normally give you the option of describing yourself as a member of one or more of these groups: American Indian or Alaskan Native; Black or African-American; Mexican-American or Chicano; Puerto Rican; Other Hispanic-American or Latin American; Asian American or Pacific Islander; or multiracial.
Many colleges aggressively recruit students from underrepresented minority populations, and financial aid opportunities are great. Most admission offices have a counselor who is in charge of this effort, and this person can serve as good source of information as well as an advocate in the admission decision process.
Talent in the arts
If you’re a painter, poet, musician, or perhaps a dancer, you can really make your application stand out — unless you’re applying to a specialty school in the arts. In that case, your talent must compete against the talent of all the other applicants. However if you’re applying to a more generalized institution, being an artist may balance any weaknesses in your application and may improve your chances of receiving a college admission letter.
Geography
At a public college or university, being an in-state resident is obviously a hook. At many institutions, coming from an underrepresented region can also be an advantage. Southeastern colleges love to see North Dakota and Montana zip codes on applications, while Southwestern schools welcome candidates from Vermont and Maine.