No, I never used a book or any equations. People would give me questions with no context, and I would take a second to think through it and then help them. Things like solving systems of equations are easy - you just need to truly understand algebra. Similarly, high school geometry doesn't get far past the axioms themselves.

As a disclaimer to all of this, I was the type that had fun proving stuff in seventh grade and had already read through Spivak's Calculus by Grade 10.