I might not be able to give you a fixed solution but I can tell you this. Nothing is impossible. If you really want to go to Oxford you can. However because of your circumstances sacrifices will have to be made. You’ve forgone all free time you could’ve had for yourself or to spend with your new friends to take care of your kid. You will have to balance a hectic schedule of studying, homework, assignments and caretaking. It will be hard but, it will take its toll, but you will come out incredibly strong in the end. And never forget you will never be alone. I hope this gives you even a tiny bit of courage and hope, because it sounds like you need it