She cracked UPSC CSE-21 with AIR-579. This was her 3rd attempt-1st Mains-1st Interview.
This means that her Prelims strategy is battle hardened over the years and her Mains strategy is for everyone to follow to clear it in 1st attempt itself!!
Following is her strategy: https://muditjainblog.wordpress.com/2022/06/16/harshivani-singh-air-579-cse-21-mental-strengthprelimsmains-strategy/