Training
Who trained, and what they are working on. The last two months drawn as a calendar rather than a list, the count for the last thirty days beside it, and the skills those classes have covered.
Rank
Where they stand today, with the whole ladder a tap away, and what it takes to reach the next rung. Every certificate and award they have earned lives here too, opened full screen and kept for good.
Schedule
When do we go. The standing week showing your own classes first and the rest of the school on a switch, the events you are signed up for, and the ones already behind you, folded away for looking back at.
Messages
One conversation with the school, never a list of threads to pick the right one from. What you write reaches the desk, and what they answer reaches your phone.
Account
Everything about the family rather than the training: what you are billed and why, the papers you have signed, who may collect each child, what you have agreed to, and your own pickup PIN.
Five, because five is where iOS stops folding a tab bar into a More menu, and no parent should have to hunt for their child's belt behind an overflow list.