Actually, most of them are not, but that's a learning opportunity! :-)

Here, public transport is super normal way to go to school, work, whatever. High schoolers generally do manage to catch those busses. Middle schooler do manage to catch those busses.

Once in a while someone comes in late. But, it is not that regular thing. Most of them in fact catch busses just fine.

This is simply untrue. Loads of students in the "high school" age range manage to get to school on time most days. Depending on the country, your 16-18 year old student might not even live at home.

If you can solve a quadratic equation, you can take a bus at 14:34 without any hassle.

Missed connections are usually missed deliberately, regardless of what is said to the parents later.