One-on-one tutoring by an expert is well known to be almost embarrassingly effective compared to classroom education[1]. It's also extremely expensive. https:/

One-on-one tutoring by an expert is well known to be almost embarrassingly effective compared to classroom education[1]. It's also extremely expensive. https://en.wikipedia.org/wiki/Bloom%27s_2_sigma_problem https://en.wikipedia.org/wiki/Bloom%27s_2_sigma_problem