Girls learn basic language before boys do. They learn more vocabulary quicker, and they generally pronounce words better than boys. High School girls seem to be superior to boys in spelling, reading comprehension, vocabulary, punctuation and in solving analogies. Many more boys than girls have reading problems throughout all ages of development, ranging from simple problems to severe disabilities. However, boys seem to catch up to girls in language skills at about the age that they go to college.
Mathematics are, as said above, more complex.
Contrary to popular belief, males are not better than females at math. Females actually show superiority during elementary school in computational ability. Males do, however, excel in mathematical problem solving ability. So, the perceived differences in intelligence between girls and boys are true, but not on the same scale as most people believe. The actual differences are very small, and may largely reflect sociocultural expectations and environmental influences rather than actual biological differences.