Can't help on Jolly Knob. The other two may be in a different part of Carter Co. There are a Mount Pleasant Cemetery and Church about 2 mile south and 1.5 miles east of what is now known as Gene Autry, Ok., on Mount Pleasant Road. This is south on Gene Autry Road, then east about 1.5 miles on Mount Pleasant Road. Depending upon when you are relating to, the school may have been near the church, which is about 0.5 miles west of the cemetery. This is all from maps, so, I do not have more information. Jim Barnes San Diego, CA