If you are willing to go for coaching, Mrunal sir and Vivek sir (Shubhra Ranjan) are very good. You can also refer Vivek sir's book (the latest edition) and see a few of his videos on SR channel.
All the famous books like Ramesh Singh, Shankar Ganesh, Mishra and Puri are good for building basics but lacking in the exam centric approach.
Another option - NCERTs.
Sriram IAS has also published a book for UPSC. You can refer to that book also. A lot of toppers have cleared the exam using Sriram notes.
Alright, So if I use sriram IAS notes along with CA and NCERT is there need for any other resource?