Yeah, here the usual way of doing is to have sixty-five to seventy percent be just barely passing (D to C in letter grades), seventy to eighty be adequate but not that great (C to B), eighty to ninety be good (B to A) and anything over ninety percent be very good (sometimes, depending on how extra-credit is scored, people can get over a hundred percent, which looks slightly nonsensical at first). Of course, different schools tinker with that to some extent, there's the pluses and minuses, and some schools (or some classes within a school) use the bell curve to grade people which complicates things and isn't very popular with students I've met.

I was really freaked out when I studied in France for a semester and a lot of my scores were in the fifty or sixty percent range. I was convinced I was failing so badly. Fortunately my school in the US knew how to convert grades from Europe, and I ended up with a lot of Bs and a few As (apparently, getting eight out of ten on any test rather blows teachers in France out of the water).