I am a very experienced teacher but I am rather flummoxed by the idea of teaching a mixed Year 4 / Year 5 class from September. The foundation subjects should be fine but I am worried about the core ones. English splits Lower from Upper KS2 - clearly, my class will be across this divide. For Maths and Science the POS are arranged in Year groups and are different - Science particularly so. I don't think a proper rolling curriculum is in place, although I know that in previous years (before I joined the school) something like that was introduced. To make it all a little trickier still I have to plan closely with the teacher for Year 5 / 6 because Year 5 are to be split between us. How can I ensure I cover the Science POS for both Years 4 and 5, and the English and Maths? Help!