I beg pardon to you for the delay in my report.
I've decided to cancel my scores

A little bit disappointed because I've lost one month... but not discouraged at all...
Well, what's happened was the hard math on the GMAT (harder than I have previously practiced, harder than in GPrep): a lot of inequalities/ number properties - DSs and PSs, sequences and at least 4 PSs with I, II, III choices. I had to make many guesses to have enough time for the following questions.
Verbal was ok, although there was a RC after the second question

Essays were a breeze for me, I even felt that I did them better than during my home practice.
Additional factors that made me worry about the results of the test were (1) a low concentration on that day (the reason might be the poor light in my testing cabin which always made me look narrowly at the screen

and (2) an anxiety that I had not managed to supress completely before the beginning of the test.
Now I am planning to retake the exam in a month (after 15 June). However, since the environment in my testing cabin (insufficient light) was unfair to me (my concentration decreased) I may try to retake the exam before the 31-day period expires.
What do you think, guys? Can they spring some surprise (hardest maths and verbal) on me during another attempt if I try to prove that the testing conditions were unfair?
Regards,
Nick