significant drop 630 -> 600 -> 540 (GMATPrep)

Hi Experts,

I need your advice regarding my verbal scores. Today i took my first gmatprep exam (after about 1.5 months of studying) and scored only a 540 !!!
This means a significant drop compared to my past exams:

1. MGMAT 630 (44Q, 32V) percentile: 63(Q) and 64(V) Mistakes: 17Q, 20V
2. Kaplan 600 (?Q, ?V) percentile: 80??(Q) and 27??(V) Mistakes: 15Q, 20V
3. GMATPrep 540 (44Q, 21V) percentile: 63(Q) and 24(V) Mistakes: 12Q, 18V

Despite an improvment in the amount of correct answers in both
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