Boston, MA 11/22/11 Three cheerleaders practice their routines in the gym, during a class. Left to right, they are: Kayla DaRosa (cq), 8; Anaiyah Allen (cq), 9, and Shakeyah Parker (cq), 9. Another 3rd-grader Yuniq Thompson (cq), 8, is at top. Jeichael K. Henderson (cq), principal of the John P. Holland School, gives The Boston Globe a tour, on Tuesday, November 22, 2011. The Dorchester school has a number of facility perks and is making changes to improve its academic programs. (Pat Greenhouse/Globe Staff); Reporter: Vaznis; Section: Metro; Slug: XXX