Education strives to transfer the knowledge and experience of those that have gone before to the next generation, so they don't have to start from scratch. As such, it is usually more efficient to do that in the language the recipient understands best, their natal tongue. But over the longer timespan of a human life being limited to your natal tongue will also severely reduce the amount of knowledge and wisdom that you have access to. Most countries address this by giving children in school compulsory lessons in other languages once they reach a certain minimum age. Children from multi-lingual homes have a distinct advantage here, their concepts are already mapped to multiple representations and they do not need to first translate what they want to say or hear into their mother language.