I also gave the GMAT on Sunday and absolutely bombed the test even got same score as you 715.
But I had absolutely horrible experience from taking It via online mode. Their software froze during startup and the proctor asked me to restart my PC.
After going through the room check procedure over again I started my test in the order of Q-VR-DI.
While there was no issue during Quant, during final questions of verbal immediately after receiving 5 mins popup the proctor paused my exam and asked me to move away from my PC as she said I was moving my head way too much. I panicked and took my hands away from desk near my lap, she said I just I was placing something in my pocket after ( all the room checking procedures even my closets and bedsheets in the room) she told me this is first and final warning and resumed my test.I still bombed DI after everything .
Recived the same mail as you and I'm getting so nervous about this online experience. I should've gone to offline centre instead.
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