It was the (difficult) Maths test in my life.

It was the most difficult Math test in my life.

Это был самый трудный в моей жизни тест по математике.

Was it the most difficult Math test in my life?

Was it the most difficult or the easiest Math test in my life?

What test was the most difficult in my life?

Whose life was this Math test the most difficult in?

It was the most difficult Math test in my life, wasn't it?