She was found hanging from a ceiling fan in her room, they said, adding no suicide note was found on the spot.
Prima facie, it looks as if she committed suicide owing to exam pressure but the exact cause is yet to be known, said a senior police officer.
She was a good student but was worried about her performance in the examination next year, police said, adding that the girl was the eldest among three siblings.
She had used a dupatta to hang herself from the fan inside her room following which police was informed and her body taken for post-mortem, they said.