Five-year-old George, the eldest child of the Duke and Duchess of Cambridge, has entered Year One at the day school where fees start upwards of £18,474 a year.
Preparatory schools are generally aimed at preparing students for examinations into selective independent senior schools, the majority of which are private.
Previous royals have gone to single-sex prestigious boarding schools as they get older.
Royal expert Richard Fitzwilliams said the overriding factor in placing George in any school will be one where he "is happy".
He told Express.co.uk this means it is too early to know if George will attend a boarding school as several key factors are likely to contribute to Kate and William’s final decision.
As well as choosing a school where privacy would be respected, the most pressing question would be choosing a school which would allow George to “realise his potential in whatever way it transpires”.
Mr Fitzwilliams continued: “As George develops and we see where his interests lie, there will be certain schools that specialise in certain subjects and areas.
But Mr Fitzwilliams said although it is too early to know if George will board or go to a day school, he is unlikely to rough it at a comprehensive. Read more from EXPRESS.