Not everybody needs to go to college, though.
37% would be a good number. High schools should be geared to job and life training for those who have neither the aptitude nor the interest to succeed and benefit from college.
Those low scores? Math and Reading skills would probably IMPROVE if less academically oriented students were learning to do something that included use of those skills.
You will never hear a high school teacher say that. For some reason becoming a plumber or electrician and making 3 times as much as a party-for-four-years major is depicted as being a failure in today's government schools.
My high school (60s) had 3 tracks - college, general and commercial. General and commercial kids usually got jobs or went into the military after graduation, voc tech or secretarial.
I doubt if even 1/3 of the entire class were bound for 4 yr college and that seems about right. Then again, you went to college to get a degree where you actually learned something useful.
But everyone should be able to do basic arithmetic, though.
I tutored students at a state college, and the, shall we say, "hood" students couldn't even do this. They illegitimately graduated from high school, which should convey some type of minimal proficiency.