Attempt the question, check the explanation, and continue with similar questions to build confidence before exams.
x^2/25 + y^2/4 = 1
x^2/4 + y^2/25 = 1
x^2/5 + y^2/2 = 1
x^2/10 + y^2/5 = 1
Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.