Non-violence is the greatest Dharma; So too is all righteous violence.
One reason why girls are doing well is that culturally and socially they are away from bad company and other distractions as compared to the boys and this gives them an edge in performing in exams.
Girls have in general also to take part in household chorus and limits their study hours to some extent. Still they are competing well with the boys.
Knowledge is power.
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease
On the lighter side, probably schools and colleges are printing girls photos more to attract good number of boys to their school or college.