I live in Oklahoma, my wife is from Oklahoma and employed by a school system in Oklahoma and Oklahoma has never funded education properly. Your outside point of view is meaningless.
Good to know that moving forward, you are limited to opining only on things that you have first hand knowledge of. That should severely limit your ability to derail nearly every conversation. We can keep it cabined to Oklahoma and audit.
Back to the point:
But Republicans felt there was still more fat to cut: While rich Sooners collected their tax breaks, Oklahoma schools suffered a 16.5 percent funding cut in the latter half of 2016. Many of the state’s school districts now make due with four-day weeks.
That's from the article Troy posted. Were Okalahoma school districts running four day school weeks before the post 2010 GOP tax slashes in the same way they are now? Spoiler: no they were not:
School districts staring down deep budget holes have turned to shorter weeks in desperation as a way to save a little bit of money and persuade increasingly hard-to-find teachers to take some of the nation’s lowest-paying jobs.
Of 513 school districts in Oklahoma, 96 have lopped Fridays or Mondays off their schedules — nearly triple the number in 2015 and four times as many as in 2013. An additional 44 are considering cutting instructional days by moving to a four-day week in the fall or by shortening the school year, the Oklahoma State School Boards Association found in a survey last month.
We can argue about funding levels -- e.g., does Oklahoma have the latest tech in their classrooms, or are the building state of the art, or are music and art classes available, etc. -- but we're talking about an entire day of classes being lopped off because the state GOP made a decision that tax cuts were more important than school funding. Losing an entire day of school very much is a consequence of the tax plan implemented by the OK GOP, contrary to your assertion that they have "nothing" to do with one another. Either that, or you have to believe that these are all just coincidences, an unexpected alignment of the stars.