Your credit score can range anywhere within the numbers. It all depends on your credit history, how well you've made payments in the past, if you have a credit history at all, how much of a history, backruptsy, repos, ect.
I thought 300 was the lowest they used with 850 the top number but I could be wrong too. There's a couple different ways they figure all the numbers in to get the 'score'.
FICO is the most common used method and I can't remember what it stands for now. Lenders will often refer to your credit score as your FICO number.
The different credit bureaus (Equifax is the one that comes to mind quickly) may use different score rating systems but they all are about the same,,different names for them of course.
Boiled down, the higher the number,,the better the risk you are for a lender to give you a loan/credit.
They love to see 800+.
I think by law you are entitled to one free credit report /per year from one of the 3 or 4 major credit bureaus.
They can be eye opening sometimes showing all past, closed accounts as well as current ones. Some you didn't even know your name was one that an acquantance opened in your name. Those can really hurt your credit.
Getting things cleaned up & the score back up takes time even after those bad accounts are taken care of.
You are in effect gaining the trust back of the lenders that ask for a current credit score and that takes time.