The suffix ~phobia means "a fear of" +whatever word goes before it. That part is usually in Latin or Greek - and it refers particularly to an irrational fear.
Hydrophobia - the fear of water
Arachnophobia - the fear of Spiders
Claustrophobia - the fear of encosed spaces
... are a few real things
In many cases people make up words as a jokey way of saying that someone is afraid of something.
In this case I think that the reference is that someone is afraid of examinations/tests.
Testaphobia is real. Infact there has been students that pass out the second they see the test. They can be a popstar, singers on stage and still have testaphobia.
There is no term for it . We can call it quizophobia.
testophobia is a fear of taking tests so things to look for are, being sick,throwing up, or feeling dizzy.
If you mean the fear of taking tests, calm down. Take deep breaths and study before a test. Do not panic, and think things through. If you study, you will ace that test!