Schools should have a pass/fail grading system on core subjects
Schools spend too much energy distinguishing between scores like 85% and 95% under the false pretense that the difference is meaningful. Perhaps high school (and lower) educations should be about meeting minimum standards for fluency in a subject. I suggest using today's C+/B- as the bar.
Our schools try to create subject matter experts in subjects which matter little to success in life. We can, of course, offer any number of rigorous, grade-based courses for those interested.
However, the objective should be to impart the knowledge needed to be productive and informed participants of our communities.