We were just working from the list of "expert hirelings " in the books,, the list did not include Teacher or chronicler so we went with 2 scribes, the cheaper one is just a clerk to take notes, chronicle and do copy work, the more expensive one a teacher for a basic education, reading ,writing , math, history, reading entrails etc.
I would expect that they could teach language skills up to lev 6, math, history to level 3-4, other misc to level 2 (with dm approval)
Anything more complicated would take a higher quality tutor and move us from scribe pay to sage pay and/or apprenticeships.