G Srinivas and M Anjaiah allegedly raped the woman, who belongs to scheduled caste, while M Rakesh recorded video of the act on his cell phone, police said.
One of the three accused had joined in the same coaching class, for the competitive examination for police recruitment, as the girl had, they said.
A senior police officer said the incident took place on the outskirts of Veenavanka village on February 10 when the three accused, the complainant, and her woman friend were returning to their village after watching a movie.
The victim told her parents about the incident only two days ago, after which her relatives beat up the trio on February 24 evening and they were admitted to a hospital in the neighbouring Warangal district.
Afterwards, a rape complaint was filed. The accused have also been charged under the SC/ST (Prevention of Atrocities) Act and the Information Technology Act.
