Their assuredness is as bold as the company behind the school: IMG, the global sports management conglomerate that has helped propel the competitive leap that high school football has made beyond traditional community teams. ... convention is being challenged by a more professional model at the highest levels as top players urgently pursue college scholarships, training becomes more specialized, big business opens its wallet, school choice expands, and schools seek to market themselves through sports, some for financial survival. ... IMG is at the forefront. It is trying to enhance its academy brand with football, perhaps the most visible sport. And it is applying a business model to the gridiron that has long been profitable for tennis and has expanded to golf, soccer, baseball, basketball, lacrosse, and track and field. The academy has nearly 1,000 students from more than 80 countries enrolled in prekindergarten through 12th grade and postgraduation. About half the students are international. ... The full cost of tuition and boarding for a year of football at IMG Academy is $70,800, although need-based financial assistance is available.