If you didn't work systematically, you ... fail the exam;Здесь нужно поставить «should» или «would»: раскройте причины почему Вы так думаете.

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If you didn't work systematically, you should fail the exam.

I believe "should" is the correct word choice in this sentence because it implies a logical consequence of not working systematically. Not working systematically would likely result in a lack of preparation and understanding of the material, ultimately leading to a lower chance of success in the exam. Using "would" could also work in this context, but "should" conveys a stronger sense of expectation or obligation.