Attempt the question, check the explanation, and continue with similar questions to build confidence before exams.
Fe + H2O -> FeO + H2
Fe + 3H2O -> Fe(OH)3 + H2
Ca + 2H2O -> Ca(OH)2 + H2
K + 2H2O -> KOH + H2
Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.