It sounds like you're referring to a specific PDF or a chapter (page 36) from a Hindi spiritual/self-help book titled "Ekagrata Ka Rahasya" (The Secret of Concentration/Focus).
Practical wisdom for a distracted mind
Since I cannot directly access or download specific PDF files, I cannot review that exact PDF page. However, based on the popular book by (which this title typically refers to), I can create a general review of the book/chapter concept as it would apply to page 36. ekagrata ka rahasya pdf 36