Tonj South Mock Exams Inspector in Warrap State on Wednesday said 446 candidates who sat in six centres received their results.
Deng Akol Mathiang said Don Bosco Girl School led all the schools scoring 453 marks followed by Kalkuel Boys School that got 449 marks, Don Bosco Radio reported.
He said less than 100 students from different schools failed the exams, encouraging them to work hard in the final exams because they have still time to pass.
Mr Akol advised headmasters and teachers to commit themselves to teach children well in their various schools.