It was about a boy and a girl who, one day, found that they became each other. They used to be friends when they were younger but grew apart. The boy was good at sport and the girl was a straight A students. They lived next door and used the tree that between them as a tool to commuicate after the "gender shift". They had to face the biggest day of they life in this period which for the girl was the interview in harvard and for the boy was a base ball game that could help him to get sport schoolarship to college. They helped each other and fell inlove during this period. At the end they went back to normal.
I cant remember the name.
I think this is not a very famous film but probably released in these two years.
And the house that the girl lived was the one Mandy Moore live in A Walk to remember/ How to deal.
Can anyone help?