In my honest view there are no such books, which are specifically made for guiding you to be a perfect Essay for UPSC

What I personally feel that all those books, guides & cheat codes are simply obsolete which usually claim to boost your preparation & essay score in CSE.

Nobody can learn & write a beautiful essay just with the help of a book which merely contains 10–20 essays in it & that too, is written according to the notions & perspectives of authors.

So rather than going behind these myths start writing, and do follow opinion pages/editorials in the newspaper and observe it very keenly. It will be you best guide and also join crash course for upsc prelims 2022

Good Luck….!!!