When I was a child, my mother targeted 50th %ile of the following grade for whole grade skips. E.g., 50th %ile of 4th grade to skip into 3rd. She did have to do a considerable amount of advocacy-bordering-on-polite-harassment to accomplish them.

Districts I've worked for or known policies for have looked for 95th %ile in receiving grade. I think it's an attempt to address perceived negative social effects from advancement, by keeping the academics barely challenging. Also maintaining the high grades and test scores they would otherwise be expected to have.

...pronounced like the long vowel and first letter of the alphabet...