Many things which are “secular-only” are totally wrong…

Many things which are “secular-only” are totally wrong or at least incompletely done: Like seat-time grade schooling, why is this not instead by mastery of a subject? This is in fact closer to the Islamic system, you must learn the subject before moving on, not just because you sat for 9 months with other classmates, then it is said: “OK, memorize things for a test, then go on to the next stage”.