This is a major thing in many East Asian cultures as well, China/Taiwan/Japan/Korea. Korea had to pass a law saying that private academies have to close at 10pm, so that kids aren't studying past midnight, but some academies still stay open secretly as the parents are demanding the extra hours. It's a vicious circle: kids compete for the few spots in top universities so they can get into the best companies, average qualifications rise, so next generation have to compete even harder for the same few spots.
This is carried over to the US as well. Asians compete for the few spots in top universities, as they are held to higher standards already, and this just keep ratcheting up the average standard for Asians each generation.