To effectively source subtitles, it is necessary to understand the film's naming convention.
Use these subtitle databases (search for Moonu 2012 or Moonu 2012 Malayalam ): Moonu 2012 English Subtitles
The film is structured into three distinct phases of the relationship between (Dhanush) and (Shruti Haasan): School Days: A nostalgic, innocent 12th-grade romance. College/Early Adulthood: Report: Analysis of English Subtitles for the Film
Beware of "machine-translated" subtitles. These are often auto-generated and can result in hilarious but distracting errors (like translating names of gods or cultural idioms literally, rather than contextually). Check if a DVD version with English subs exists (e