D's are passing grades but may keep you off a sports team or school activity.
Passing grades. Still, do the very best you can, and the grade will be more than just passing. To many students strive for grades. Do not strive for grades. Strive to become the best professional you can and the grades will take care of themselves.
No.
failing grades are thus subject have failed because of absences and not passing their recquirements..
Work very hard.
A's,B's,C's, and D's
Yes it does cause i means you would do good with your grades because you must be passing all your classes to do it
passing, same as any other sport.
Yes,5th graders can get good grades. All you have to do is work hard and study. Plus, if you remember stuff for tests, hopefully you'll get a good grade. 
A D- average is usually the lowest passing grade. Some schools however may set higher standards.
they have problems or they are passing through rough times
All elementary schools have 2nd 3rd 4th and 5th grades.