Dear Jayant, PRMO will be held on August 11th, 2019. To be qualified for Registered Mathematical Olympiad, it is important you attempt PRMO from a recognised Institution. Their official website is http://www.mtai.org.in/prmo. Only NIOS students can register individually. The rest of the students have to register through a Registration Centre. To check if your school comes under ' Registered school' you need to visit their official website. However, all Kendriya Vidyalaya, Jawahar Navodaya Vidyalaya and Atomic Energy Central Schools can also also register students from other schools. You can try this approach.