I don't know personally, but all I know is that it will be more competitive and challenging since everyone is smart. So just make sure that you are prepared for that and maybe do some study to get ahead bc ppl in selective probably would do that lol. Friends might also be a factor, so try to create some in the early stage so u don't start to hate school, and above all try ur best and try to enjoy yr 11 bc yr 12 will be a tough roller coaster.
Hope this helps