Some athletes start three years in advance, others three months. In principle, the earlier you start, the more places in college teams are available and the more time you have to prepare everything properly. In the USA, the admissions committees of universities look at your high school grades for the last four years, so that actually starts in HAVO 2 or VWO 3.
Are you thinking about leaving to the USA but are you not sure when to start the process? Please contact us!