High school students are earning more As, but average standardized test scores are falling.

A new study that examined graduates between 1998 and 2016 found the proportion of students with A averages increased almost 10 percent in under 20 years, climbing from 38.9 percent in 1998 to 47 percent in 2016. That means nearly half of all high school graduates earned an A average. The average grade point average also rose from 3.27 to 3.38 in the same time period.