What are the minimum resources to follow for clearing the UPSC exam?

As a UPSC aspirant, you are advised to concentrate on a few standard textbooks, such as the NCERTs, to bolster your fundamental knowledge, as well as other standard resources, such as Lakshmikanth for polity, class 11th and 12th NCERT for geography, and similar books. However, as we begin this preparation, a lot of individuals we meet are giving us advice to do this or that, and we are continuing to buy new books or materials from the market.
I understood this notion when I was attending the mains preparation classes from one of the best coaching institute for IAS in Delhi- EDEN IAS. When I started with ethics preparation under there guidance my perspective was totally changed because they are also acknowledged to be dealing with best coaching for ethics. Moreover, earlier I have to struggle for the resources pertaining to ethics but now the situation was not like this because they provided us with complete set of 4 books for ethics preparation which was complete in itself and there was no need to struggle elsewhere for other resources.
In a similar way, I have investigated some of the topics that fall under their purview, and it has resulted in some positive outcomes. For instance, the book they provided on polity was a compilation of several key texts that an aspirant couldn't study on their own, but it was made possible by this combination of all the key resources into one. Thus, this assures one thing that they are dealing with best foundation course for UPSC and because of which also they act as the one stop solution.

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