Firstly congratulations on your fantastic results- and as to your mum- why is she not proud of the results you have? Why is she disappointed with a good GCSE pass? I only got a C at GCSE Lit- am now an English teacher, hold a degree in literature and mark the AQA GCSE in English literature! If you plan to go onto further and higher education- and it sounds like you are- then a C is really all you'll ever need.
I don't mark the new spec (which came out thsi year) but I can say that this year's examination was very hard- I marked 494 exams and gave only one A*, and only a handful of As. That said, if the school wants them remarked then it's up to them and good luck- but remember grades can go down as well as up!
My advice is to put it to the back of your mind and concentrate on this year. You have a very important year ahead and it's vital to focus on examinations you still have to take, not those where you've done all you can and you can't change.
BTW well done on your excellent results.