Packed down
When you know something so well, you might as well have it tattooed on your forehead. Like 'down pat,' but with more swearing and fewer metaphors.
She packed down her speech so good, she could deliver it while riding a unicycle and yelling at a raccoon.
He packed down the script so well, he could perform it while being chased by a goat.
The kid packed down his math facts so much, he could solve equations in his sleep and while eating a whole pizza.