(Khan Academy is excellent. Over a decade ago, my home-schooled daughter [we were not living in the US at the time] used Khan Academy throughout high school, scoring 2300 on the SAT and getting a full scholarship to a prestigious US college to study engineering.)
(Khan Academy is excellent. Over a decade ago, my home-schooled daughter [we were not living in the US at the time] used Khan Academy throughout high school, scoring 2300 on the SAT and getting a full scholarship to a prestigious US college to study engineering.)