Nowadays I would also guess that the majority of people across the globe live in societies where nepotism is conceived of as bad. There might still be various amounts of it but people generally tend to discourage or punish nepotism when they can.
But there are a bunch of services helping "teach the test" for kids going to college/grad school, and in very, very many ways, middle class (or better off) parents do strive to give their kids tons of advantages that other kids do not have. Is it fair that my kid had access to their own computer and all the books they wanted to read, etc., when others didn't? No, but parents are still going to help their kids.
If we had something resembling a really fair system, kids and adults of any age would be able to take classes and learn whatever, with as much help as they needed. It would be expensive, but fair. That isn't what we have.
Most societies become pretty practical after a while, and strive for people to be reliable and adequate for the roles they're appointed to play and celebrate the occasional master of some craft or pursuit. Being groomed for an opportunity from childhood, under the attention of one's family, often delivers on those and so a lot of societies don't worry about it except when it's obvious that somebody completely incompetent has ended up responsible for some influential or essential role.
It's actually a very peculiar modern experiment to expect every role to somehow be filled by the most capable person and for every person to be appointed a role that they're personally passionate about. Maybe it'll give us some amazing Star Trek utopia someday, but you don't see that idea expressed very much in history and so we don't really have reason to know what will happen if we try to make it so.