While some kids think of summer as a perfect time to work on their tan and enjoy a much-needed vacation, a growing number of high school and college students are using that time to make themselves more attractive to future employers. According to the Georgia Department of Labor, teen unemployment for that age group dropped to 29 percent for 2011 from 36.3 percent in 2010. “I think the market in general is improving for them,” Tim Evans, Greater Hall County Chamber of Commerce vice president, said.