Help with high school more classmates mod

I'm trying to use this mod in the link about having to add certain teens to attend high school, but making it all work is difficult. I then added the sims to different classes and then assigned the principal, professors, cafeteria people and janitors. But it still doesn't work well. Like not all the students appear at the school and only one class is active whiles all the others are somewhere else around the school especially at the library surrounding the computers. I don't know how I can make this all work properly. I need like step-by-step instructions to do so. If anyone knows how to use this mod and can help me, that would be a big help.

https://www.nexusmods.com/thesims4/mods/1463?tab=description&fbclid=IwAR2_rVsi-34eAwH2S3FAwqqaT1YX5Hb2gLcTa45_vhObg2-36t1tSACPhD0