I do OK when Iam do timed sessions- for example 15 Scs, 15 CRs or 5 RCs but I really mess up when I do a complete verbal section of a CAT test.I get nervous, lose concentration,run short of time and end up with a disappointing score

. I guess I have the exam fear.
Iam taking the actual test on 13th of August. On the GmatPrep Iam scoring in the range of 650-720. Any words of advice will be appreciated. Looking forward to your support and guidance. Thanks.