Something that is worth mentioning here is that, in general, creditors do not have access to your credit files and therefore do not know your scores when they send out those offers. In short, they don't really know if you are a good or bad credit risk when they send you "pre-screened" offers. They merely obtained your name and address from some bulk mailing list somewhere. Only when you choose to apply do they do a hard inquiry on your credit file(s), and really find out what kind of credit risk you are.
Unless you opt out, some (all?) reporting agencies may classify you into a broad group and "share" (read: sell) your contact info to various creditors they think will be a good fit. But we can't know for certain if that has happened, and it's just as plausible that your name was put on some mailing list by some other entity--a school, another lender, who knows.
I used to get these pre-screened offers for various (and nutty) credit cards in the mail that were advertised as "exclusive" (to entice the recipient), where the annual fee was hundreds of dollars and the interest rates--although nowhere near 400% APR--were definitely on the higher end of what's commonly available, around 18-35%. And I put a stop to that, not only because I wasn't interested in such offers, but also because I didn't want to open myself up to mail fraud and identity theft. There's supposed to be some number you can call to automatically remove yourself from all pre-screened offers of credit for a certain period of time, at least in the US. If you don't want the credit reporting agencies to share any information about you to creditors for marketing purposes, you need to opt out with each one.
But, as I mentioned, the nature of these offers do not necessarily have any relation to your actual creditworthiness, because these creditors don't actually know what's in your credit files, and at best, only have some vague idea of your score range based on demographics and/or your broad financial associations (e.g., some other creditor sold your info).