Should schools get a failing Grade

When you think of how hard you work at school is it really worth all the effort. I myself happen to enjoy school very much, but what about what really counts. As a senior in high school I know I have 28 more days here. I know i have learned how to read and spell and do math problems, and i feel confident in to going to the real world and college. However that is just my opinion. On another hand, one of my friends just found out she wasn't graduating because she isn't ready. She has never failed a grade, but its things as simple as not being able to read over a 3rd grade lever. Things like not being able to spell "these" or "trees" that are holding her back. Things like she doesn't know the difference between a quater and a nickel so she gives dollars for everything and always gives her friends the change. You may ask why don't you help her? She won't let anyone. She is too proud. Now here is my question. I understand her not wanting to ask her friends for help. But I know teachers notice it, because I along with many other students have heard teachers talking about her. Yet if she couldn't count money in elementry school why did they send her to middle school. If she couldn't spell these or trees or puts all for yall why did they send her to high school. If she's not ready for the real world why didn't they help her more. Why did they wait to a month before graduation to tell her she can walk across the stage with us, but will not graduate. Why didn't the teachers see this before. Why didn't her parents help her when she couldn't give her mom her change back from the grocery store. when she came in with a few wrong items why didn't they help her. I blame the school and her parents for this. I just wish someone could have caught this earlier so she wouldn't have been cheated out of 13 years from kindergarden to 12th grade to find out everything she has been through was for nothing.