1: Is A-Level maths required to be 'good' at game development?

2: Do you need a degree to go into game development?

3: Do you need any experience to go into game development?

4: (Not sure if you know, and if you do i'm sure it varies from job to job) When you get hired as a game developer, do they just expect you to do everything like "Ok make this guy do this when this happens" or do they 'train you' as such.