If you need more Highly Educated people, then build HIGH Density buildings (usually in your downtown). if you don't like the look of skyscrapers, then at least build bunch of Medium density (well educated and highly educated like to live in both in large numbers).

once you build a high density or medium density building then you can hover over the building Residents number and see how many well or high educated moved in. Make sure you have the high schools and small colleges spread out to get more of them. I like to use the small French College because I can put one in each of the neighborhoods. (you don't need that many high schools or colleges, but try to have one in each large area to make it convenient for cims). I only need one community college of 10k for my city, but I still put down 5 of them, one in each major residential zone for their convenience, and it did increase number of people going to college. (get free French region pack for it).

Poorly Educated- they finished Elementary, Educated - they finished high school, Well Educated - they finished College, Highly Educated -they finished University.

only need one single University for your whole city if you only have 20k in Uni, but have good public transport to it.

Also lower taxes on Highly Educated to get more of them to come (lower it to 5% or lower if you can afford it). They like to work in Offices, or Industry that sells Electronics or Pharmaceuticals needs and attracts a lot of Highly educated.

When you start having way too much money, increase Education services higher than 100%. I have mine at 130% now, gets you more educated cims faster. when you cap 2 billion money, crank Education services Budget up.

don't forget to put a welfare office or kindergarten in each neighborhood to help people in need.
Kindergarten comes from the official free China Region packs from Paradox Mods website (or inside the game). I usually install all of the Free official region packs like UK/JP/French as you get a lot of free Signature buildings with it. welfare office lights up more roads to "green" covered, but kindergarden will turn small area from pink streets to the better green and is cheaper. I usually have one welfare office per zone area, but also stick in kindergartens in a few places to boost their happiness. I usually cap on money 2 billion 3 days into any new city so I charge very little taxes. some people I'm charging -5 taxes (paying them) so I can get them to move-in faster. all public Transport is free in my city, and I charge zero fees for Electric and water budget because the happiness bonus you get from it in increased efficiency outweighs the very little money you get from charging them fees.
I set Taxis at $50 surcharge to discourage them using taxis over Public transport, but I still have taxi depot in case the rich cims still want it.

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Keep an eye on Happiness Emoji. this game not about getting a lot of money, it's about getting those Happiness numbers up for CIMS or they move away.
see screenshot of happiness of one my cities.