Have tax payer money go to a national comittee of member professors who work on updating the standard curricula (with good version control), any time there's a change or new hotspot in the area of say cell biology, they can review/update and "push" their changes to the master for merging.
The print textbooks used in schools in several parts of east Asia have had a rational production process like that (hire experts to determine what is really essential content, and then have pedagogical experts work out the best way to present the content) for years. That's one of the big reasons why, even when Japan, Taiwan, Korea, and Singapore were poor countries (are you old enough to remember those days?), they made good educational progress through effective schooling for the broad national population, and why none of those countries are poor anymore. The United States is still too "fat and happy" (I like that dialectical English term for "complacent") to do something as efficient or rational for its school system.