Attempt the question, check the explanation, and continue with similar questions to build confidence before exams.
F(n) = F(n-1) + F(n-2)
F(n) = F(n-1) - F(n-2)
F(n) = 2F(n-1)
F(n) = F(n-1) * F(n-2)
Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.