Sooner or later that lack of revision is going to bite you in the arse regardless of if you're a girl or boy. Slow and steady wins the race!
My school has a girls school and a separate boys school down the road. The boys school consistently does better than ours, with more of their students getting A*s at A level and GCSE. They also seem to get more oxbridge places than us. So yeah academically it seems that they do a lot better than us even though a lot of them are pretty dense and immature when you actually interact with them. We still have very clever students but the boys seem to outperform us most years.
I work in a dept which has about a 70:30 split male to female, but the women that do work here are seriously ****ing impressive. I've never put much stock on either side of this debate, really. I know more male meffs than female, put it that way.
Boys have more uneven developmental profiles but girls tend to be more even across the board with the possible exception of being weaker in STEM subjects but this could be cultural rather than biological.
Culture plays a part as well. South Asian boys as a whole are academically ahead of south Asian girls of the same age but the reverse is the case for Jamaicans although more often than not boys excel in PE. South Asian students, of both sexes, tend not to be good at music or take music for GCSE.