Talk to a recruiter and give them your high school / college transcripts, take a drug test, and get a physical screening. You can choose to be in the Delayed Entry Program, where you can wait to go to boot camp until you're ready instead of going right away.

Apply with over a 55 on your ASVAB and youre golden, I had to wait a whole year in ored to get the job I wanted. So plan accordingly. The goal of these changes is to achieve a healthier, fitter force over the short and long term with more Sailors taking the PRT resulting in fewer failures and better mission readiness.