Sorry to hear this. 530 is not a poor score but i know how you feel especially since your target was to make the 700 cut.
Perhaps when you cool down, you might want to sit, analyze and share what you did wrong such as
1. Did you run out of time?
2. Did you practise under timed conditions?
3. Did you get enough rest before the test?
4. Did you lose stamina during the test?
5. What were your specific prep strategy?
6. Were you nervous?
7. What areas of the test (RC, SC, CR, DS or PS) did you find rather challenging
...to mention a few.
I am sure the experts on this site can help you and advice you towards re-taking the test if you intend to do so.
Also note that sharing your story (good or bad) would help motivate you and prepare others who are still looking forward to their test day.