Fair enough about the medical practice thing, and I suppose that in a many-life-critical context like becoming a doctor or lawyer you would prefer to have a very low false-positive rate coupled with a high false-negative rate.

I can't help but feel that the problem lies in a fatal combination of non-filtering teacher training (as sentimented by "oh, anyone can teach", and as mentioned by that recent Finnish education post), community culture that talks more than acts about the importance of high quality education and self-motivation, and a lack of funding for those (like OP) who give it their all.

edit: I also think that we should encourage a sense of trusting (maybe government-trained) educators with being able to identify which children in their class need to learn what, better than a test could. I'm not so sure what the benefit is to ignoring the individuals at the 'dx' scale of the educational calculus.