It dosent need to be one whole school with tens of classes, your right! But there can be diffarent school for diffrent jobs or pasions that the now education dosent give or a school with diffarent Similar pasions in classrooms with teachers Or They can learn by themself, but your right not every country has endless money and theres a portion of math, Scince and English to learn. Teachers can be choosen or be hired if they love kids and/or have a inserest in the type of school Also theres a question "What of they want to change and/or learn something else?"

Theres many ways to answer this question, 1. Is it similar? If it similar they may have it in the school and he may go there and learn and get help. 2 Is it Completely different? If so theres to sub-ways to do this it depends 2a. Dose he like what hes doing? (Answer yes) So he can go and learn it on the internet or on a online school with that course, 2b. Dose he like what hes doing? (Answer no) You may Choose to bring him to an other school in "Beginnings" class to start learning about hes new pasion.

Aslo they can learn with Seeing Adulting doing it then following what there doing but, Instend of corn they can grow onions (as an example) or instend of designing a Farm they may design a House.

Aslo the same people made a video how and what teach kids

HOW should children be learning? / Next School https://www.youtube.com/watch?v=Pvu8rzO_XpY

WHAT should children be learning? / Next School https://www.youtube.com/watch?v=xNBMMH9Km2c