Starfleet Officer Candidate School was an 8-month course for personnel wishing to become a commissioned Starfleet Officer and possessing a combination life experience and training that allowed them to bypass Starfleet Academy.
The curriculum was offered at various locations throughout the Federation.
On Earth, it was hosted in San Fransisco, but off of the Academy's main grounds.
On Tellar it was hosted by the Tellar Recruit Training Center twice a year.
Satellite courses were offered throughout the Federation, as well as on planet when a world joined the United Federation of Planets. Depending upon a candidate's previous experience, they could be commissioned with a rank between Ensign and Lieutenant Commander.
Psi Upsilon III