SCTC, the Starfleet Command Training Center, was a 23rd century institute of higher learning complex affiliated with Starfleet Academy. It was located on the planet New Montana in the Alpha Centauri system of Sector 002.
History and specifics
The complex accepted 700 officer candidates per month. It was the sister facility of the Starfleet Training Center which took in 1,000 enlisted personnel candidates.
In 2250, Master Chief Petty Officer Mary Elizabeth Gianni explained the basic function of both centers to cadet James T. Kirk. As Starfleet Academy only had the capacity to train 20 percent of those who apply, the two training centers did their best to weed out the other 80 percent. (TOS novel: Academy: Collision Course)