Educational weirdtopia:

All children start out as fast uploads in a realistic simulation environment that starts out resembling stone-age hunter-gatherer life. They can't die or be seriously hurt in the sim. To proceed, they have to reinvent civilization and science by themselves. The sim is populated by AI-controlled characters, who occasionally nudge them towards the problems, like "this fire thing you sometimes find around sure is handy, too bad we can't make any ourselves" or "I think someone's stealing our cattle, but there are so many it's hard to know if we still have all we had yesterday". The sim proceeds to more advanced environments as the children work through more complex problems like mathematics, mechanics, construction and basic scientific method. Children may stay in any level of the sim indefinitely long if they have not yet figured out how to proceed or just prefer to stay where they are.

Once they have figured things out up to uploading human minds and running them in a simulation, they know enough to recognize the telltale signs that they are currently in a simulation. They can now let themselves out and be recognized as an adult. Young adults out of their sim will be basically speaking a private language and may have an extremely idiosyncratic way of conceptualizing science, but they should be reasonably well-equipped to start figuring out how their new surroundings do things.