Test was three days ago and I needed some time to cool off myself before seeking some help.
Would like to provide some background info first before asking some comments/help:

- Length of study: fulltime three month. 40hrs per week.
- Materials used for study: OG13, gmatclub app for OG tracker, MGMAT sc, GMATPILL sc
- Error Log : downloaded here at gmatclub and used to keep track of timing and problematic parts
- Tests :
... PREP1 540(Q42/V23) beginning of my study (didn't finish both sections)
... MGMAT1 590(Q45/V26) 1 month before actual test
... PREP2 660(Q50/V29) 1 week before actual test
... GMAT1 570(Q50/V17)
*** PREP1,2 and MGMAT1 was taken in a library with full length AWA and IR with same amount of breaks as the real test.
I tried to simulate as close it possible because read some discrepancy between prep tests and real test here in gmatclub.
Someone kindly asked me about whether I took the preps in a different condition or not. Thank you for this comment.

I guess most of you guys probably never saw a score like, V17 (13 percentile).
I am very shocked to see this score on the actual test.
This would look very bad even if I improve the score for the next few month, right?

I had a feeling that I did okay until I saw the score. Managed overall time really well.
Although I had a feeling overall question seemed to become pretty naive toward the end of the test.

Most troubling part is I don't have a clear idea what went wrong. Nothing rings a bell.
Can't think any red flag on the test day other than I felt somewhat tired after the quant section.
Maybe "not knowing what went wrong" somehow explains my low verbal score.
Yes, I did attempt all 41 problems.
For all the mock-tests, I could assess valuable information to guide my study.
From the test data, I learned I was constantly getting over 80% right on CR and RC problems and around 55% on SC.
I knew my weakest point was SC and I invested significant amount of time on SC.
It is a little bit unfortunate, I don't get any feedback from the real test which matters most.
Honestly, I'm a little bit afraid right now.

For those who took the actual test, I would like to ask about the timer.
When I was done with verbal section, I had about 45 seconds left and the 45 seconds timer was still ticking while I was answering optional information.
Is this normal thing? I'm not 100% sure but when I finished with quant part, I had more than 3 minutes left but it prompt me almost right away whether I would like to take a break or not. Also, Is it really true that the few questions at the beginning are really more important than the others?
One more thing. Would re-take will help? I mean my V17 score will go nowhere.
Also if I have to re-take, when would be the ideal time?

Thanks for reading my post.