You don't know what grade you got on your test? Groudon will help you! This is based on something at school I did the other day. Letter Grades: Now, be REASONABLE here. This is meant for a REAL test, so it only works when you're not goofing off with it. A: 100 or more to 92 A- 91 to 90 B+ 89 to 87 B 86 to 83 B- 82 to 80 C+ 79 to 77 C 76 to 73 C- 72 to 70 D+ 69 to 67 D 66 to 63 D- 62 to 60 F 59 to somewhere in the negatives Infinity: Um, let me think... S or Infinity... NaN: YOU ARE TRULY AWESOME