The best time to overhaul a brain is during puberty. An FDA approved retrovirus can deliver a standardized mix of improved genes. Better working memory, better concentration, better creativity and 20 points to your IQ, guaranteed. You won't be able to compete in today's market without it.
Dramatic changes to your brain don't come without side-effects. A fission will occur, between your per-pubescent and adult selves. Your memories of childhood will become distant, scattershot, and difficult to recall. You are a new you, after all.
No childhood memories means teaching children is a waste of time. Education is for adulthood, once it will actually stick. You should make sure your kids don't kill themselves, but otherwise they can be left to their own devices. You see them, running in packs, speaking strange words, playing strange games, conducting strange rituals. I wonder what you were like.