Proven tutoring models of all types should be a standard offering for every school. More research is always needed to find more effective and cost-effective strategies. But there is no reason whatsoever not to use what we have now.
The only way to improve data-driven scores en masse is to use public policy to address the main cause of low test scores: poverty. The only way to improve them in a given school is to teach to the test.
Why is it still considered socially acceptable to brag about how lousy one is in the subject? What does it say about society's attitude towards science and technology, in a country which used to be at the forefront in that arena?