Ok, I guess he did it to keep it separate while converting, but it might be confusing to people that are used to regular Lexville - I've ran a quick convert on ModLexPreg to ModSchool to keep the mod instructions the same as regular Lexville. Should also make the converter work. Reuploaded Lex+Preg.ALL IN ONE is explained above if you want to add mods to the LexPreg combo you install the image folder of each mod on normalschool or modschool (if is the lexville) and everything else (like items, events etc) goes to "ModLexPreg".
Or you convert it with whatever tools let you i use vscode, add the mod folder, search "\NormalSchool\" or "\ModSchool\" and substitute all the results in the folder with "/ModLexPreg/"