This would be great if the whole cohort from 1 primary all went to the same secondary and that secondary only had one feeder school. In practice secondaries get kids from many schools (we have about 15 feeder schools) and so the kids would all have different experiences of each subject and would be at different points as well. Brum tried something like this about 10 years ago. It was called a transition project. the idea was that after KS2 SATs everyoen switched over to the project. there were exercises and lessons in science, maths and english which were supposed to prepare the kids for their secondary schools. In the secs we had the follow on work which the kids would pick up when they arrived in September. Lots of money was spent (in my school at least) producing piles of resources from the packs ready for the off. 1st lesson in science my class looked at the stuff sideways! Of the 30 kids only 2 had done any of the work in primary! The whole lot got binned and we refused to take part the following year.