540...No idea what went wrong.

Hey guys,
Ive been studying for the GMAT since September 2012, I used OG13, Manhattan set of 8 and kaplan. I felt so ready for my exam, all sections of it. My first Gmat prep i got 540 but the second one, which i did a few days to the exam i got 730, this for me was proof that i was more than ready.
When I got to the exam center, everything went smoothly, I sailed through the first ten Quant questions and it was at that point that i began to worry, wondering why they had remained easy. Seriously, there was no trick about these questions, they were all so easy, the kind i would have passed even without practice.. However, i decided not to worry, thinking that maybe in third world countries (I live in Uganda) the test is simpler than in other countries around the world, so I kept on doing all these easy numbers, In all 37 questions, I only remember 1 question I wasnt certain about, Infact the most difficult question was a 45-45-90 triangle. I was over joyed thinking that maybe my hard work had paid off, since i could do almost all the numbers.
The verbal on the other hand, was consistently tough! I never caught a break, my SC consisted of entire sentences underlined and my passages were long.. I also had a lot of those two bold face statements questions. But I pushed on, Verbal is my strength so I ploughed though it.
I was certain I had done better in quant than in verbal, so imagine my shock when i saw my score.. 27Quant and 38V.
I have never scored so low in quant, and I dont think i could have scored that low with the questions I was asked. My first instinct was to think that there was a problem and maybe the test wasnt computer adaptive in my particular case, which would explain why the quant remained so easy, and the verbal so hard. Especially the quant.. these were primary school questions.
The worst thing about my experience is that, if there was no error, then i truly do not know where I went wrong.. As far as i know, I killed that quant section, it was too easy to get wrong, and I dont know how to prepare for next time, because I dont know what mistakes I made.. I dont know how my final score could be the same as my diagnostic test.. And all the CATs I did were in exam conditions, right down to the time i woyld get started.
Is there a way I can find out what I got wrong in the exam, so i can see for my self that I failed enough questions to get me to 27Q?? Because right now, Its so much easier to believe that the system didnt work.. and my sections stayed at the same level of difficulty throughout the exam instead of adapting to my strengths and weaknesses.
Any advice is welcome at this point.. I am poor and do not want to spend another 250$ unless I absolutely have to.. and I have no idea where to go from now, though I think I will email GMAC and ask them if everything is Kosher at their Uganda centre. *sigh*