I have been searching for the International Math Olympiad(IMO) qualification process in Pakistan and I found out that students take the NMTC(National Mathematics Talent Contest) paper which to get into you have to have certain marks on your O levels. Then 50 of the top students are chosen which are invited to a training camp. The people are narrowed down until 5 are left. However, according to my knowledge, some parts have changed and I couldn't find reliable sources to confirm what has changed.
What I am asking for is essentially the qualification process and the sources which are important for the information.