Yes, and the overall grade is normally the better of the 2 covers (usually the inside cover). But I believe it's been brought up in here before that that's not always the case (meaning that the overall grade is not always the better of the two). Not exactly sure why that is though unless the higher grade is the outside cover.
Yes, the overall grade is normally the better of the two covers.
Sometimes the grade in the top left is not the grade of either cover. All of the covers, all of the pages and all of the stapes are graded. In other words, they assign a grade to the book, not just the covers.
Can't believe I have to drag this book out again.