On Credit Scores

I'm thinking of a number between 350 and 850. Give up? It's my credit score.

I'm assuming, here. As far as I know I have no credit score because the only card of mine that I charge to is actually a check card, so it's basically a debit on steroids. Still, if I have a calculable score, it's supposed to be between 350 and 850.

My mom's credit score is 852.

I have no idea how she did it. But I want in on it.