I know this is controversial, I'm not very happy with DS's prep school and would like to move him at 11 plus as he has had offers. However if he gets offers to 13 plus schools, I would like him to attend one of the two we have put him forward for as they are both top notch. Would it be ok to accept an 11 plus school and then move at 13 plus and would he be adequately prepared for the 13 plus school?