1/ The colours mixing together can be done with different gradient shapes of different colours. You don’t worry about the circle, you just make it rough.
2/ Then to get the circle you can use a circle masks to cut out the middle, or a colour.
3/ Then use a ring to cut out the outside circle.
A mask will show the car colour underneath if it’s metallic. If the car is just a regular colour like black you can just use a black shape to cut out the holes.