Too Many Town Kids! Boarding Solution?

My Nraas was on default speed at first. But I let it go on for too long. The residents had too many babies. Look at the crowded school! My sim hardly gets in the doors, nor do they. She tries to arrive by 7 to be first.

At her ballet recital, many were still waiting since morning, hungry.

And these aren't run-o-the-mill townies, they're S.V. elite residents: Alto, Goth, Keaton, Hart etc. So I don't want to delete them.

I slowed the speed a while ago, but by the time the babies grew to school-age this is what has resulted.

So I tried to send about 40 (20 remaining) to boarding school with MC. I did: 'Sim, Intermediate, Career, Choose School, Dribble-dine, Non-Active + Age (child, teen) + Days to Transition (10 +), selecting the top 10. Same for the Art, Military and Peace. Anyone remaining had 10 days at most until Teen or Young Adult, further diluting.

However, I went back today to see if it worked next game morning. Still a handful arrived, but not the boarding school one's. Then at 9.30 my sim got ejected, I sent her back in, which seemed to work - she did go on the field trip. By 10.30, my sim got ejected from her field trip, sims still lined up at school, tardy and caught by error-trap. I checked MC at the school for sim statuses. After the field trip ejection, not before, some of the boarding school sims began being listed on the MC, Sim, Status, Personal for the school lot, although I'm not sure if they were actually there.

I have earlier saves I made before doing the boarding school idea, just in case.

Did I do it wrong, the settings and commands? Is another mod module needed? Does it take more than overnight for them to leave?

Would a second school solve the crowded situation? How do I do that?

Or is my game lost, as in took a wrong turn, don't let them make so many babies again, start a new one?