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Could you tell me if I need to say I couldn't not do it or I couldn't have not done it?
My future career depended on the exam, so I couldn't not pass it.
My future career depended on the exam, so I couldn't have not passed it.
What I am trying to say is that I passed it because it was absolutely necessary.
These structures have different meanings and to me, the second sentence is somewhat unnatural.
I couldn't not pass it. = I had to pass it (because my career depended on it).
I couldn't have not passed it = I passed it (because it so easy it was impossible to fail).
