Consider this: trying your best to raise 6-7 children (of any sim age) and prepare them for university!
Toddlers - 2 adults recommended for 6 toddler sims! I always feel overwhelmed with toddler sims, if two seems like too little you can do 3 adults and 5 toddlers.
Children - 1 adult for 7 child sims!
Teens - 1 adult for 7 teen sims!

Find my build for this challenge or create your own lot for your boarding school. My origin tag is zelerey and it's titled "Boarding School Challenge".
Normal life span recommended, I feel money cheat is necessary or if you don't wanna cheat money then freerealestate. *insert eye roll here*
Okay here goes;

**Toddlers:
Skills to be developed: Communication, Movement, Potty, Thinking, Imagination
Daily Schedule:
6a-8a - Breakfast made by adult, all kids eat breakfast
8a-10a - Potty break/ adult reads to kids
10a - 12p - Skill building*
12p - 2p - Lunch made by adult, all kids eat lunch
2p - 4p - Outside playtime (best judgement with weather )
4p - 6p - Potty break/ Skill building*
6p - 8p - Dinner made by adults, all kids eat dinner/ Bath-time and ready for bed
9p - 6a - all kids in bed and sleep through the night

Skill building schedule (skills focus changes daily to be less repetitive)
M - Thinking skill
Tu - Movement skill
W - Communication skill
Th - Imagination skill
F - Thinking skill
(Potty skill is developed twice a day every day: even with a few accidents this skill should be maxed in no time)
Sat - go on an excursion/outside play/free day
Sun - relax day/movie night/cartoons on tv

**Children:
Skills to be developed: social, motor, mental, imagination
Daily Schedule -
6a - 8a - Breakfast made by adult
8a - 3p - Classes (*at school)
3p - 7p - Homework, Projects, Skill building, Hobbies, Music practice, Outside play
*5pm - Dinner made by adult
7p - 9pm - Baths, Reading, ready for bed
10p - 6a - in bed, sleep through the night *bed monster will not occur overnight if kids are in bed by 10pm*

Skill building schedule:
M - Mental / Music practice
Tu - Motor
W - Imagination
Th - Social
F - Mental / Music practice
Sat - go on an excursion, have kids create a club, hobbies (drama club, scouts)
Sun - relax day, movie night (dinner at 5p, in bed by 10p)

**Teens:
Skill categories to be developed (teen sims have normal skills and most skills have been categorized based on kid sim skills): Mental, Social, Creativity, Motor
How skills were categorized:
Mental: Logic skill, handiness skill, herbalism skill, programming skill, rocket science skill
Social: charisma skill, comedy skill, mischeif skill
Creativity: all musical instrument skills, painting skill, writing skill
Motor: fishing skill, fitness skill, cooking skill, gardening skill, videogaming skill, wellness skill

Daily schedule:
6a - 8a - showers, Breakfast made by adult
8a - 3p - Classes (*at school)
3p - 10p - Homework, Projects, Skill building, hobbies, music practice, going out/staying in, teen jobs
*5pm - Dinner, made by adult
10p - 6a - in bed sleeping through the night

Skill building schedule (any skill in the specified category)
M - mental/music
T - motor
W - creativity
Th - social
F - mental/music

**Teen jobs (these are the ones that fit into the schedule)
Fast Food - 5p - 9p MT
Lifeguard - 5p - 9p MTW
Retail - 6p - 10p SM
Club:
Drama Club - 3:30p - 5:30p
Scouts - 2p - 4p

End goals: raising these children to the best of your abilities, this can be three separate challenges OR one really long challenge from toddlers to teens.
*If you do decide to do the super long route, you will need to adopt 1-2 children after yours age up to a child (the 7 toddlers 1 adult challenge is really hard, not for the faint of heart)

Toddlers stage - Fill all skills to max, be sure that each toddler learns to walk, talk, potty, and practices all flashcards with an adult.
Child stage - Fill all skills to max, complete childhood aspiration, study at least one musical instrument, join a club: drama/scout, A+ student in classes
Teen stage - reach level 6 in atleast 2 skills in each category (total of 8 skills at level 6), study at least one musical instrument, join a club: drama/scout OR teen job, A+ student in classes, and choose life aspiration based on skills progressed, apply to university, choose degree based on aspiration/skills progressed, send off to college

Points system:
Toddlers -
1 pt. per level for each non-maxed skills per kid
5 pts. per maxed skill per kid
Child -
1 pt. per level for each non-maxed skills per kid
5 pts. per maxed skill per kid
10 pts for completed childhood aspiration
1 pt for each aspiration requirement if not completed
5 pts. if joined club
1 pt if C student
5 pts if B student
10 pts if A student
Teen -
12pts per level 6 skills per teen
4 pts if level 6 skills represent each category
2 pts per level less than 6 per teen
2 pts per musical skill earned
5 pts if joined club/teen job
1 pt if C student
5 pts if B student
10 pts if A student
*once young adult
5 pts per standard degree accepted into
10 pts per distinguished degree accepted into

This challenge could potentially continue onto the university level if you wanted to, all students would need to live together! Be sure in Create a Sim that children are not family members but roommates and romantic relationship could be a thing inside the group.

I hope you have a wonderful time playing with this challenge, I've always wanted to come up with a challenge and I'm glad to finally did it! Looking forward to trying this challenge myself! Don't forget to check me out on Origin, my username is zelerey! Follow me and download the house I built for this challenge and the family I made as well!