My son moved schools half way through Y4 (from local primary to private) we had been on the waiting list for 3 years. We fell in love with the school, but our biggest worry was helping him fall in love with the whole idea, of leaving behind a perfectly fine primary school and lovely friends, to start a fresh.
Initally after his entrance exam they thought he may have a few english concerns, they suggested extra lessons etc (this shocked us, as we had, never had any reason to be concerned) but it soon came to light it was the mere shock of having to take a written exam!
THe biggest struggle he then had was that he had year end exams within 4/5 weeks of starting, the school however were fantastic in preparing him, and he came out with very pleasing results.
He is a middle of the road kid, highs and lows, and has improved in his weaker areas, and strengthened in his stronger and favourite subjects. With regard to the language shock, he loves them!! Latin, French, Science, PE (initial reason for choosing this paticular school, was based on the sport available) and Math are his favourite subjects!
We too are at this school for the long term, and our concern was getting him in before he had to sit the entrance exam for seniors along with 40 other children, with only 20 places available, he will have to sit that exam as a current pupil but his place is pretty much guaranteed.
He is happy, confident and has made some lovely friends, it is the best thing we ever could of done for him.