I totally agree about every day life exposure. In addition, Grandma is an AIG teacher so every Sat. the girls do science, math and other fun activities. Grandma almost had a fit when she learned that our DD might not get accelerated because she didn't do well on a state created achievement test. Grandma was furious that the Cogat and Iowa were not taken into consideration.
By the way, DD loves Khan, but I am having to "play the system" to get DD what she wants - more challenging classes. I can't set up Khan to teach just 4th grade Common Core. ALEKS supposedly is set up that way.