Let's talk about two common strategies people use for introductions. First is the funnel approach and second in the anecdotal approach. Either could be used for a topic like yours.
The funnel is a metaphor for beginning with a broad idea and narrowing down to your thesis statement, just like a funnel is wide at the top and narrow at the bottom. So, for example, if I were writing a paper on jazz, I might begin with a general statement like this:
There have been many forms of popular American music.
Now the reader has a general idea what the paper is about, but does not know yet what the specific idea is for the paper. But as the reader goes on, I will narrow things down, and I will end the paragraph with my thesis statement.
The anecdotal approach means opening with a little scene or story. In the case of your topic, this might be creating a scene in your grandmother's school room and another scene that is more contemporary. This can be a good way to get the reader's attention and gain interest.
I have provided a link that has a few other strategies that are commonly used for introductions. Good luck!