But i'm sure that was just a mistake lol don't worry.
Anyone can get all A*, even i could. I'm just too lazy. It doesn't matter too much at the end of the day... The courses are designed so the children can understand everything. And if you understand everything you've been taught boom A* if you revise.
It is possible, but really revise hardcore. You've got to want it soooo much, you will be capable if you put in the effort. You should have started to revise by now, if not start right away. Don't panic though, work as much as you can, don't leave a topic unless you fully understand it, then after you've revised it once, go over it again and again, at least 4-5 times I reckon. But it depends on the individual, some people can revise more efficiently than others, whereas others may have to revise it more times.