Plenty of good advice on here regarding check and re-check your answers. What I will add is that as it can be your lines AND/OR your calculations, if/when you have time at the end, re-do everything to check.
I had exactly the same thing happen to me, in fact, looking at the bearings you gave, it sounds the exact same question.
I brought it up with our CFI/Examiner at the time, as I felt the tolerances were rather too close. I remember that my answers came smack bang in the middle, maybe only half a degree favouring one side or the other
All I can say is RELAX when you resit, and don't let it bother you too much !
If only most compass's were swung with that much accuracy
Best of luck !