K-12 Teachers, and especially HS teachers and their students could make good use of Evernote IF were affordable.
While Google Keep is okay, it doesn't offer the breadth of abilities and features that Evernote does.
But Keep as one key advantage - it's FREE.
Most school districts, even with the educational discount for business, are going to buy a district wide subscription -- they view Evernote as too much a niche product.
Thus it falls to teachers to pay, once again like so often, out of their own pockets.
Getting it into the hands of HS students builds future, hopefully, lifetime users; just is recognized by getting it to the hands of college students.
So, for most HS teachers and students we have to rely on Google Apps for Ed and for other sites like Pinterest to save our notes.
Sad, as those work arounds do not offer the level of integration and organization that Evernote does.
But, they are far, far more affordable.