Negative self-talk (cognitive anxiety) is defined as the negative statements you tell yourself before and during tests. Negative self-talk causes students to lose confidence and to give up on tests. Students need to change their negative self-talk to positive self-talk without making unrealistic statements.
During tests, positive self-talk can build confidence and decrease your test anxiety. Using positive self-talk before a test can help reduce your test anxiety and improve your grades. (taken from: wvup.edu)