So the Y11 Mock exam results have been analysed by SLT and apparently my dept is underperforming in comparison to last year. Last year my subject was on legacy spec A*-C and my Y11 students achieved roughly 70% A*-C in the mocks. (I won't be exact to retain my anonymity). This year my subject is still on legacy at GCSE and my students achieved almost exactly the same in the mocks. HOWEVER, as other subjects are on the new Grade 1-9 system, they are counting 5-9 grades as being A*-C. So as far as I'm concerned I should be down as getting roughly 70% 5-9 grades in my dept. However, as a 5.5 is a B they are actually only counting A*-B grades from SIMS and so my pass rate has dropped to about 45% 5-9. They reckon this is accurate / reliable. But as far as I can tell, using my data and trying to convert it into 5-9 grades has meant my department looks like it is underperforming when it is not. Anyone else experiencing this and if so, how did you get round it?