The problem with test driven education is that it rewards memory over reasoning. There are many kinds of intelligence, but IMO memory is not much of an indicator, and thus testing fails.
When I took my O levels and A levels in UK, testing was still an unpleasant part of school life, but the tests were almost all essay and paragraph answer questions with only 25% being multiple guess. These exams had to be read and graded by a tester, increasing the odds you may fall victim to an examiner who just did not like your style, but increased the odds you actually knew the subject matter.
