If he likes TAMU, a full tuition scholarship there is fantastic (probably comes with some academic perks like priority registration or special honors classes?). It’s affordable, he likes it, it’s a great school .. no brainer 
If, like most would-be premeds, he discovers more interesting subjects to pursue, a TAMU degree will serve him well; and if he does keep on this path, he will receive an excellent education.
To prepare for med school he needs to
- take General Chemistry with Chemistry majors and rank in the top 20%; take General Biology with Biology majors and rank in the top 20%; limit damage in Organic Chemistry; also take Calc1, Biostats or Statistics, English Composition, further English or Interpersonal Communication, Psychology, Sociology, Spanish for Health Professions, Physics1&2, Biochemistry, Neuroscience or Cognitive Science, Ethics and get as many As as possible (most of the above classes count as gen eds).
- have a major that allows him to pivot to a job if he doesn’t get into med school (most students who completed the pre-reqs never make it into med school) - that major can be anything he can get As in. If Biology, add courses in DS or Statistics and/or add lots of lab experience.
- be of service toward various groups and people - volunteer at a shelter, for instance; get clinical experience as a CNA, EMT, scribe.. helping in clinical settings.
He may want to add TAMUs Student/Campus Life where students volunteer.