THE mathematics of school examinations is about to change. The logic: per-mutations and combinations have always thrown up the best results. In what is being dubbed as a progressive move, the Council for the Indian School Certificate Examinations (ISCE) recently announced its decision to make maths and science optional subjects in Class IX. Subjects that children with "special abilities" in the 813 Indian schools affiliated to the Board neednot be burdened with for the Class X exams.