So many possibilities:
Failure to study the material
Failure to read the questions completely
Inability to focus due to emotional stress, poor diet, bad health, lack of sleep.
Errors and mistakes in answering
Poorly worded questions
Lack of preparation
Headaches - Apex
Lost of appetite
-APEX
One symptom of anxiety would be having heart palpitations.
Depressive disorder
They are not the same. Hyperventilation can be a symptom of anxiety.
Yes
This is usually a symptom of stress and anxiety.
Test Anxiety
anxiety
Homeopathy and traditional Chinese medicine approach anxiety as a symptom of a systemic disorder.
To beat crippling anxiety once and for all you need to see a trained professional psychiatrist to get to the root of your anxiety.
Test Anxiety is perfectly normal. It's the Anxiety of the test itself, but since your under pressure, your become Anxious. (Please pardon my spelling, I'm from Austrailia.)
Since a symptom of an anxiety attack is hyperventilation, as long as the breaths are slow, deep, controlled breathing it can help reduce an anxiety attack.
Yes it can, it's a common symptom that comes with the Gilbert's syndrome.