When i was in yeshiva, the school grouped us by ability. There was an elite shiur, a middle of tje road shiur and a needs help shiur. If the school isn’t big enough, then it’s the rebbe’s job and responsibility to not take the easy road and focus on one group ( usually the best students). It’s not impossible. For decades children in different age groups werr successfully educatex in one room schoilhouses. It’s not fair to add to the financial burden of already stressed parents
