If you intend on attending a 4 year university to play a sport you will need to register and get cleared by there respective eligibility centres (NCAA and NAIA) to prove you have been in continuous education and not been a professional. This does not apply to student-athletes attending community colleges. The fees to register for these eligibility centres is a one time fee of around $150, which covers the administrative costs incurred by the respective governing bodies to review and approve your eligibility.