i think i have exploit to do the club popularity at occult club, here's the thing
i found a student that has perk "school celebrity" that can increase 40+ popularity when joining the club, i kick out the student at the club and invite him (i do the kick and invite repeatedly), i did that until the club became number 1 in the statistic. there are only 3 member in occult club and i can easily reach the top statistic doing the "kick and invite"(but in the club management number of participants continued to increase until the 70 even though there were only 3 club members). v 0.927