Hey,
I decided to talk about my GMAT experience yesterday because I am so nervous about the result and I would be so happy if anyone can calm me a bit

So I took the GMAT online yesterday.. I was not really amused about the shift from enhanced exam to the old one, but it was okay. My target score is only 600.. In practice tests, I started with 510 some months ago and at the end of my studies, I achieved 630, 620 and 600 and felt confident about doing the exam (600 was under unfavourable conditions, someone called me and so on).
My exact mock scores were:
Official GMAT 1 630 (Q38, V38)
Veritas Prep 620 (Q41, V35)
Official GMAT 2 600 (Q35, V38)
I took the exam at a friend's house because his internet connection is better and no one would disturb me. Everything went smooth, I was ready half an hour before start and had no problems during check-in - I was actually the first in the queue!
Then it started to become crazy.. I saw the first quant question and was really confused. My strategy was to take time for the first 10 questions, so I tried to work it out but couldn't do it so I skipped after 2,5 min. It was not getting better. Question after question I had no idea what to do. The concepts were so random.. I had probability and hard permutation stuff.. also geometry.. Nothing for the "go-to" concepts. There was no way to gain confidence.. I tried to just keep going but it felt horrible. I was guessing most of the time and even when I though "Oh, I know how to solve that!", I started calculating and got an answer which was not in the responses.. And yes, I had the value that was asked for..
My motivation was down and there is no break between quant and verbal so I had to keep going.
Verbal part was good, I finished a bit early (8 min I think) but it was alright. IR is not important for me but it was also good.
I am now desperately waiting for my results. I don't want to retake the exam and pay the fee again. I was so confident in the preparation and mock tests. In the exam, it felt like I studied for nothing because I could use literally nothing from my studies.
Do you think that I may have guessed right in the first questions and therefore, the exam thought that I was capable to solve harder questions?

Or do you think I still have the chance to achieve 600 at least?