A teacher of extension maths in oz has been quietly gathering data on his students. (Its a discussion in our awake psychology / mental health group). He shows these students who did year 11 advance maths in year 10 had amazing grades but now as current yr 11 students their abilities are slipping dramatically. Of cause its only a small study group overall and the worse I think slipped by 20%. His tried getting the principal / parents etc to think why - they just simply imply "stress / covid lockdowns" and maybe its partially to blame but the rest of us are thinking its the pokie as they all are and STILL all masked when not a requirement here.