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