Remember, feeling "good" about the GMAT could be a bad thing.
My first attempt through the exam, I had a "good" feeling. Result: 610
My second attempt through the exam, I felt like crap (didn't sleep the night before, food not settling in my stomach due to lack of sleep, stressing on the questions, etc.). Result: 710 (but lower AWA).
I *felt* like I was going to do worse on my second attempt. The questions were difficult, and I got stuck on a couple verbal/quant problems breaking the average of ~2 min/problem.
My guess is you need to take another diagnostic to identify your weaknesses in verbal, make a study plan, and go from there. You should also work on your time management (mainly for verbal). Time management is probably the biggest struggle on the GMAT.
Hopefully this helps.
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