[D] Anyone tried training language models on simple (elementary school) text first and fine-tuning on progressively more advanced text?

Seems the way people train language models today feels like sending a preschooler to a college library and telling him to start browsing books.

Anyone know of papers describing language models being trained more like a child?

Perhaps starting with preschool books with a tiny vocabulary and short sentence fragments like "goodnight moon...", moving up to "the lorax".... and then fine-tuning on elementary school books ... then jr high level reading ... then high school .... etc.

I'm guessing this …

advanced books child college elementary fine-tuning language language models library machinelearning people preschool school simple text training