Pursuing graduation with UPSC preparation is the best option for Humanity subject students. By choosing this way you may prepare your optional by using the resources of your graduation. You can make the best of your college facilities like free internet and books needed for IAS exams in the college or university library and accommodation expense. This reduces the burden on you, unlike other IAS aspirants who have to shoulder other responsibilities as well. You have age and time on your side. Make the most out of it!