Hospital and School building estimations.

Hello
So i'm getting a bit confused about the current estimated needs for the country population that's shown towards the amount of hospitals and schools that's needed....or shown as estimated need.
For i currently have twice the needed Hospitals and all school buildings and once the amount of people hit over 200 mill, it all tank.
I got twice the shown need of school's and buildings and i'm constantly updating the education needs as it's needed.
I got to 230 mill and then it looked like something froze for i stayed there for several ingame month's and then it just decided to drop.
First 600k a month and then 500k and then down to the current amount which is just over 300k a month.

Why is it showing a estimation of so and so when that's clearly not the amount needed?
And why would this kind of population drop issue happen suddenly with no slowdown in the amount of population that's being generated/born?

It is not clear what you exactly mean.
"it dropped" what dropped?

For good education, make sure your education index is 200+
this means that the school index, the high school index and the university index should all be 200+
then, the education index will follow.
It will end up at a level of the lowest of the three indexes I mentioned.

If you want us to look at a situation in your country, it helps if you tell us exactly where it is.

World name and country name and what the problem is.

A 200 index is a bad idea.