Your system is not scaling very well. Everything ended up being +1 or +2 or even not even +1. So I am tweaking it to this ...
Old Base +

= +
Education
- Mathematics Academy = +3 Education Per Turn
- Engineering School = +1 Education Per Turn
- Astrology School = +2 Education Per Turn
- University = +25 Education Per Turn
- Library = +5 Education Per Turn
- Knowledge Inheritance = +3 Education Per Turn
- Elementary School = +5 Education Per Turn
- Civil Servants School = +3 Education Per Turn
- Museum = +5 Education Per Turn
- Great Library = +10 Education Per Turn
- University of Sankore = +25 Education Per Turn
- Oxford University = +25 Education Per Turn
- Siam Ho Trai = +10 Education Per Turn
- Newton's University = +25 Education per Turn
- National Library Service = +5 Education Per Turn
- National Archives = +10 Education per Turn
- Plato's Academy = +25 Education Per Turn
- Tally Stone = +1 Education Per Turn
- Counting Stones = +1 Education Per Turn
- Online University = +25 Education Per Turn (Got to also fix per city)
- Learning Center = +5 Education Per Turn
- Propaganda Office = -5 Education Per Turn
- Military School = +5 Education Per Turn
- Planetarium = +5 Education Per Turn
- City College = +10 Education Per Turn
- Private School = +5 Education Per Turn
- High School = +10 Education Per Turn
- Calligraphy School = +1 Education Per Turn
- Smithsonian = +20 Education
- Science Symposium = +5 Education (plus keeps its science)
Note I boosted some too but this seems a bit more constant than by cost. Especially since many do not go obsolete.
EDIT: I also did not change the

with a tech or resource so some educations builds can produce

too.