The Starfleet Academy Preparatory Program was an academic program active in high schools throughout the United Federation of Planets. It was designed to prepare students for Starfleet Academy. Students who wished to become cadets usually began the program in their junior year of high school, though some began earlier.
The program involved field trips to various Federation worlds, familiarization with Starfleet vessels, and exposure to numerous disciplines that were taught at the Academy.
As part of the program, Jeffrey and Tyler Sinclair were on a field trip to Vulcan in early 2379 when their Timothy Sinclair came to visit them before reactivating his commission. (Star Trek: Pendragon: "True North")