Quite a lot of argument went on with a loaded question from the OP. Let me tell you what I think (scientifically).
Men better than women at science and math - WRONG (scientifically)
Women better than men at science and math - WRONG (scientifically)
Men and Women equal at science and math - WRONG (scientifically)
Huh? You might think the last one might not be wrong. Well, it is wrong scientifically along with the first and second one, cause there exists no conclusive way by which you can measure scientific competency in a human being quantitatively. Scientifically, you simply cannot count how much scientific a person is. There is no metric to experimentally measure. (Like you take a person and do an experiment and you obtain a real number, telling you about scientificity.) There is just no conclusive evidence which shows one is better, worse or equal to the other.
Examination is just another statistical measurement. Because, we do not do any experiment on the scholar's brain, separating neurons, proteins, molecules, wavefunctions ..., trying to determine what caused what (the conclusive way) and link the scholar's scientific capability with some basic constituents of his brain. There's no scientific theory/definition of science itself relating it to the physical world. The examination process assesses the competency in science depending on various variables (question choice, time limit, student background, preparation for examination, date and time of the exam, student selection, future/past generation … etc). The examination score does not guarantee anything, but indicate the possibility. A high-scorer still has chance to perform poorer or vice-versa at a future time if any of these variables changes.
All we currently have is social "science" (statistics), trying to figure out who is "better" and who is "worse" from statistics, or far worse, propagating the argument of "equality". We are neither better, worse nor equal to the other. If asked, the simplest answer is: we do not know. A lot more harm is done in the name of gender equality when some special program discriminately favors one gender over another gender. As I say, create the option, but stop promotion. If there’s less female in science and math field currently, it is fine. All we have to ensure is that there is nothing stopping them from entering the field. But this does not mean that we should just give away the opportunity to them to be politically correct. Unequal gender ratio in these fields will not cause any harm to the society, but gender discrimination will.