5. I took MGMAT tests(for the first time) in the last 10 days before the actual test and had consistently scored in the 650-680 range on the 6 tests.
5. I took the GMATpreps and scored 730 on GMATprep1 and 760 on GMATprep2 (Gmat prep 2 was two days before the actual test).
Do not do this again. You burned yourself out in the days leading up to the test. It is very easy to study too hard / do too much in the week before the test and then you are mentally fatigued by the time you take the test. You may not notice, because mental fatigue is different from physical fatigue - you don't necessarily feel tired. But you can feel "slower" - it takes longer to comprehend when you're reading - and you also feel more impatient - you just want the test to be over, you're sick of making decisions and answering questiosn, you almost feel like you don't really care anymore.
Plus, you would have been even more mentally fatigued because you did not do the essays on the practice test. You started the quant section more than an hour after you were used to starting the quant section. And when you started the verbal section, you were normally used to being finished or almost finished with the entire test!
In fact, i don't think i got a single question wrong from the first 10 questions.
I guarantee you 100% that you did not get the first 10 questions right. NOBODY does because the questions would just keep getting harder and harder. Think about it - after a few questions, you would start to get really hard questions, and if you got those right too, you'd start to get nearly impossible questions. Is that what the questions felt like?
No. You said you solved them easily. Unfortunately, that means that you were making mistakes - some of the questions were likely a lot more complicated than they seemed, but you were missing the complications. So you thought you were right, but you had actually already missed something.
Okay, so what are we going to do? Both quant and verbal went down significantly, so this wasn't just one section going poorly. In particular, your strength (quant) went down significantly. Your description of that section as "easy" tells me that you were likely missing small details that would make the questions harder, and then you'd get those questions wrong, which would actually lead to easier questions. So some of the questions really were easy (for you) and some were ones where you were making careless mistakes.
Why were you making so many careless mistakes? I would bet that part of it had to do with stamina, as I discussed above. You also mentioned some issues with stress management in your first post. Can you describe more how you feel / what happens in terms of stress / anxiety? That would also likely lead you to make more careless errors.
Finally, you knew that you were having both timing problems and careless error issues before you went in - you said so in your first post. Just so that you know for future: don't take the test if you have either major timing problems or significant careless error issues (or both). When those problems exist, one common outcome is a big score drop, unfortunately.
What about verbal? Have you been having timing problems on verbal? Have you been making lots of careless mistakes?
Read that time management article I posted in my last post. It usually takes people a good 4 to 6 weeks to fix timing problems, so expect to need some time for this.
p.s. the unscored research section is for the new version of the test that's going to launch in June. It doesn't count toward your score. The potential "surprise" was that they randomly choose some participants to win a refund of the test fee - as long as you do really try to do a good job.