Questions

The error lies in the first part of the sentence. After superlative adjectives, majorly two prepositions are used: of and in. We use in with a singular word referring to a place or group. Eg: I am the happiest woman in the world. We use of before plurals, before time periods such as year/month. Eg: Sunday is the best day of the week. Here, in this case, the subject is the 'school', thus, it should be 'in the school'.

The Ryotwari system was introduced by  Sir  Thomas  Munro and   Captain   Alexander   Read   in 1820.This system  was in operation for  nearly  30  years  and  had  many features  of  revenue  system  of  the Mughals,    Under    the    Ryotwari System  every  registered  holder  of land is recognised as its proprietor and pays direct to Government

Two Indians Bharat Vatwani and Sonam Wangchuk are among the winners of this year’s Ramon Magsaysay Award 2018, regarded as the Asian version of the Nobel Prize.