Original sentence: English is the primary medium of education, students though are required to learn Hindi as compulsory second language from class 1 till 8.French or Malayalam can be substituted for hindi in class 9 & 10
Edited sentence: A General Knowledge test and a UNO test are conducted by the UNO as well.Apart from this there are Olympiads for Maths, Science and Computer Science conducted by the New South Wales University, Australia for classes 9th-12th.English is the primary medium of education, students though are required to learn Hindi and Arabic as compulsory second language from class 1 till 8.French,  Malayalam, Hindi are offered in classes 9 & 10