Attempt the question, check the explanation, and continue with similar questions to build confidence before exams.
x^3 - 3x^2 + 3x - 1
x^3 - 3x^2 - 3x - 1
x^3 + 3x^2 - 3x - 1
x^3 - 3x^2 + 3x + 1
Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.