what do you do if you have test anxieties? What is the best way to resolve test anxieties?
Cognitive behavioral therapy, conducted by a licensed mental health professional, does reduce test anxiety.  This is usually used in severe cases.

Students who are told that it is normal to be anxious will feel less anxious and perform better.  Students who are told that being anxious will help them get a better grade also get a better grade than students who are not told that.

Reflecting on why education is important helps students overcome their anxiety.

These strategies are based on experimental evidence.