You know, I asked something similar a while ago and the most sagest advice I received was to go by my initial reaction after walking out of there. I sat outside after the test (b.c. it was so nice and I didn't / couldn't drive at that point yet) for like 45 min. and reflected. But instantly, before I reflected, I know/knew where my strengths were and were not in the test. I know I screwed up part of RC and part of Games, which really sucks. On the other hand, I know I rocked LR. So, as you, June 27th will be a really great or horrible day.
Try to think back to how you felt the day after the test. Also, if you already haven't, and it's not too late, craft up all the details you can remember from D-day,like a self reflection list and I mean detail it. After writing it, look at it tomorrow and see how you feel. That should help. At least this helped me and hoping it will help you too.
Good luck. hth