Hi quickqwerty
Guessing several questions at the end of the test can possible lead to a bad score. As GMAT punishes for consecutive wrong answers, I think probably you have made several mistakes in the last part of verbal which has pulled your verbal score down. Your quant score is great. How was your performance in
GMATprep? If you have scored 700+ in
GMATprep then I would suggest to appear for the test once again
good luck