The No. 1 thing millennials would do differently if they could go back to college

According to TD Ameritrade's Young Americans & College survey, millennials ages 22 to 28 say that the top piece of advice they'd give their 18-year-old selves would be to work and earn money while enrolled in classes. Nearly one-fifth, 19% of the survey's 1,026 respondents wish they'd taken a part-time gig.