Hello everyRanter,
I'm going to build a simplified management system for primary school (that would be another story).
I need advices about considerations to take, implementations and tips to make the system helpful for users and decision makers (administration), and make it modern as possible.

Use something that already exist :) u don't want to provide lifetime support for it

@noogli this.

@noogli as I know, there is no system that provides mobile version or a robust API to consume.
Mobile version is very important for thus case of business

Probably not for the exact usecase but I'm sure there is software that can be bended in some ways to for ur needs. If u find a software that cover 70% go with it and maybe the implement the rest over time. On the other hand it s a experience u get and if the money is good is good u can do it yourself but that generally not the case in this sectors

Use brainfuck to make it.

@noogli well, the (that would be another story) is that I'm planning to open a private primary school with some partner.

Better discuss it with the other experienced school teacher, students and the likes.

@cursee and for tech points, I would be using traditional web app structure like PHP(laravel) with either Vue or react. For mobile, react native maybe.

SMS usually consists of
- Stu registration
- fees application
- attendance
- curriculum
- grading

If you wanna have e-learning together, don't do it yourself, maybe integrate with Moodle or something.

Make it secure af on the children’s data side. That is all... as long as there’s benefits in your application for whatever use case a school can come up with it’ll be sweet. Just secure the kids data.