What am I SUPPOSED to do?

Okay, I'm sure you've read about my mom not teaching me. (Unless writing my Craziest dream, and reading Huckleberry Finn counts as teaching) Well, I called a social worker and she called a hotline for me. Well CPS came today. They're talking to me tomorrow. What am I supposed to say? If i tell the truth I'm afraid of getting in trouble! But I want to go to school. My mom has said she'll print some stuff out, but I WANT to go to school. I've been teaching myself, and she and my sister BOTH are going to lie.