We cannot possibly know without extensive study of the sort mentioned by mathanxiety, what the reasons are behind this.
We certainly cannot assume that; education has become over feminised and the way of learning that favours girls (coursework, presentations etc) favored over that which favours boys (exams).
It is much more likely to be about socialization than 'feminized' ways of learning - unless by feminized we mean 'methods of learning that involve behaviour that girls have been more socialized to express than boys'.
Girls are socialized to behave, to sit still, to please, to listen, to be quiet, to do what they are told and to work extra hard if they want to achieve. Therefore is is not surprising that girls do well with evaluation methods which involve working hard all year and not just on exam day.
Boys failing is not a good thing - anyone failing is not a good thing. I suspect the answer lies in educating boys to knuckle down and work hard and not expect male privilege to save them the bother of having to work as hard as their female counterparts. (I say that as someone who taught in a university for 10 years and who also taught and tutored 'failing' students in apprenticeships.)