Hi Selma - sounds like a tough situation with a few different things going on. To specifically answer your question about the F in comprehension but B in reading, comprehension is only a part of reading, but a big one. So, it could be that your grandson did really well on tests in other areas of reading (such as reading fluency, which is how fast and accurate he can read), but did poorly on just the comprehension portion. Comprehension is also the "final piece" in the reading chain, so it could be that he's doing quite well on more basic parts of reading, but struggling with putting it altogether in the end.

You also asked how it could be that he could get an F in reading comprehension yet not be failing other subjects, and that's a good question. The truth is that grades are based on many things, such as participation, attendance, homework, etc., and each subject can be graded differently. So, it could be that he's getting an F in comprehension because he didn't turn in homework in that area, didn't participate, or simply because he did bad on a few tests in that area. The simple answer is that grading in schools often doesn't make a whole lot of sense, and isn't always the best way to know if your grandson is doing well in that subject or not, because there are so many things that go into making that grade.

I think the bigger issue is the breakdown in communication between you/your son and your grandson's teacher. It seems like if that teacher were doing a better job communicating, you'd have more specific answers about grading is done in that particular classroom. Do you have any ideas about why the teacher has stopped communicating? It could be that if that improves, you'll get more answers about things like these differences in grades.