Ok, this about the Education thing, I have read that some players complained about the drop in education or tech level once you put a tower. I can only explain it this way, a single tower apartment level holds quite an amount of residents. So when you put in a new apartment level, those new residents will bring down your overall education and tech level, like an average number. I did some little experiment, although it did take me quite a long time...lol!
I used library when I 1st started the city, then moved on to Grade School when students number reached to around 350. When the school capacity maxed out, I replaced it with a High School. When it's about to max out again, I plopped a Community College but keep the school. Until I get to around 5-green hats, then I plopped The Academy for some high tech researches.
That will convert your normal factories to high tech building, and they will start to complain and close down the business if your education level is too low.
In this picture, my Electronic Factories are in the progress towards tech upgrade. Well, it's Jan Year 10 now.
The key, I believe is to have the patient to build it nice and slow. Wait for things to progress one after another. I think if I plop another apartment level now, the education level will go down too...lol!
Anyway, have a great day, and enjoy your game. Cheers! :)