Most institutes teach Prelims and Mains as separate events. A student clears the objective cut in June, only to realize in July that they have forgotten how to write a subjective answer.
An online complete course from a reputable platform costs to ₹1,00,000 . Add a good internet connection and a tablet: ₹25,000. Total = ₹1,25,000.
Perhaps the most underrated component. You need a mentor to guide you on which books to read, how to manage time, and how to deal with anxiety.