Test anxiety is actually a type of performance anxiety — a feeling someone might have in a situation where performance really counts or when the pressure's on to do well. For example, a person might have performance anxiety just before trying out for the school play, singing a solo on stage, getting into position at the pitcher's mound, stepping onto the platform in a diving meet, or going into an important interview.

Like other situations in which a person might feel performance anxiety, test anxiety can bring on "butterflies," a stomachache, or a headache. Some people might feel shaky or sweaty, or feel their heart beating quickly as they wait for the test to be given out. A student with really strong test anxiety may even feel like he or she might pass out or throw up.

Test anxiety is not the same as doing poorly on a certain test because your mind is on something else. Most people know that having other things on their minds — such as a breakup or the death of someone close — can interfere with their concentration and prevent them from doing their best on a test.

https://kidshealth.org/en/teens/test-anxiety.html#:~:text=What%20Is%20Test%20Anxiety%3F,pressure's%20on%20to%20do%20well.