In one study, 288 juniors of high school science students were tested in two groups  One group chewed gum for 10 minutes before a math test, while the other group did not chew gum  Overall, gum chewers reported 20 percent less anxiety than non-chewers  Specifically, low anxiety chewers reported 36 percent less anxiety than non-chewers
Chewing gum doesn't relieve test anxiety.
 Moderate-anxiety chewers reported 16 percent less anxiety than non-chewers