What is the ruling on a niqabi covering her hands if the circumstances of co-educational study hinder her from doing so?

It is not permissible for a woman, especially one who wears the niqab, to mix with non-mahram men in study or work, due to the corrupting consequences that arise from such interaction, including each party looking at the other, which is forbidden by Islamic law. A woman must lower her gaze, and it is not permissible for her to display any of her adornments to non-mahram men after the revelation of the verse of hijab. Her entire body is an adornment that must be concealed, except for visible garments.