The topper of the JEE (Mains) exam in Assam has been arrested for allegedly using a proxy to write the engineering entrance test, the Guwahati Police said. The accused, Neel Nakshatra Das, had scored 99.8% in the exam. His father and three staff of a testing centre have also been arrested. According to the police, the accused went inside the testing centre on the day of the exam just to fill his name and roll number on the answer sheet and the test was written by a proxy outside. Police said that they are probing if the case is a part of a larger scam.