 Typically, marks of several students are calculated by adding 40% of the NSEP score, as a percentage of the maximal marks attainable in the examination (generally 240) to 60% of the INPhO score, as a percentage of the maximal marks attainable (varies from year to year).A list of the top 50 students is hence prepared, and the top 8, who are willing to appear for APhO, are selected.It may be noted, however, that only 5 students were registered for APhO in 2017 and 2018.