My 11 year old stepdaughter came here two years ago with English very much as her second language. She came to a new country, a new school and was the new girl in an already established class. She had time just to attend year 5 and 6 in Primary school but she still got a grade 4 in all of her sats test results. This is only an average result I know, but I saw on the news that one third of the kids taking the tests never even got that.
So well done to you Ate! and good luck in the big school in September!