Level A maths is the hardest maths you can get. Level B maths is not so hard and level C maths is about the same as primary school maths.
Neither. It is maths
Yes I do
the angle at which you hit the ball depends on maths
Yes, there is accounting and financial accounting in business administration.
The answer depends on why you want to study maths. A level maths is at a significantly higher level that Additional.