Kolkata: State Education minister Partha Chatterjee on Monday said that his department will carry out an online survey involving schools at various levels to ascertain the student-teacher ratio. It is the first step by the School education department towards the rationalisation of teachers in schools. An online survey will be conducted to know the status of PTR in various schools. The state education department has started English medium education in 92 government or government-aided schools in the state. It would, however, have no impact on the Bengali medium schools..