Alexandra Martinez, a cheerleader at St. John Paul II, signed with the Texas A&M Kingsville cheer and stunt team during the school's college signing day celebration.Martinez competed on the Centurions' varsity team all four years and served as a team captain. She was also named an All-American cheerleader."This is amazing. For me just because TAMUK, I'm visiting it. They're so community oriented and that's something that being here at St. John P…