It is a gross generalization to say that girls are easier to teach  than boys. There are too many variables to consider such as the subject  matter being taught, the ability level of the individual student, and  the skill level of the teacher to be able to say with certainty that one  gender learns material more easily than the other. However, my teaching  and learning experiences have shown me that there are some areas of  early education in which girls have a temporary advantage over boys. One  of those areas is in reading. Girls learn to read more quickly and  easily than boys do because of the way their brains process information.
According  to David Sousa in his 2005 book How the Brain Learns to Read, boys and  girls process language differently. Girls have a larger and thicker  corpus callosum, which is a bundle of neurons that connects the two  halves of the brain and allows them to talk to one another. This allows  girls to process language on both sides of the brain. Boys tend to  process language mainly on the left side of the brain.
Simon  Baron-Cohen, the director of the autism research center at Cambridge  University, validated Sousa’s claim in his 2005 article “The Male  Condition,” which was published in the New York Times. In the article,  Baron-Cohen notes that females often learn to talk faster than males,  they make eye contact sooner, and that females normally activate both  sides of the brain hemisphere when they are engaged in language-based  activities, whereas the male brain mostly utilizes the left hemisphere.
The  ability of the female brain to process language in both hemispheres  gives girls an early advantage in the classroom when it comes to  learning spoken and written language. Girls are able to learn to speak  more quickly than boys. They also have less difficulty than boys when it  comes to acquiring literacy skills. 
 As a reading specialist  with a background in early literacy, my experiences have shown that  girls tend to learn literacy skills more quickly than boys in the  primary grades. However, this early advantage is only temporary. Boys  take longer to learn to read, but by puberty there is little or no  difference between the reading ability of boys and girls.
 As a  general rule, it is not possible to say that girls are easier to teach  than boys. However, when it comes to developing literacy skills in the  primary grades, girls have a definite advantage over their male  counterparts.