The Naulets Mains platform will be launched within a week. It | Naulets – The UPSC App

The Naulets Mains platform will be launched within a week. It will again be new and unique. The subscription charge would be minimal [within Rs. 1000]. It will have concise notes for GS1,2,3,4.

You won't need to refer to anything else as far as GS is concerned.