I gave my GMAT in the last week of July and I'm only posting my debrief now. I had intended to post it on the day of the exam itself but I was so burnt out I never got around to doing it. Recently, a friend of mine approached me for advice on preparing for it and as I narrated my experience I got excited about it again and decided to finally post it here. Hope it's of some use
A few facts about me that give some context to my preparation. I'm a native English speaker and my college degree was in Maths. But that don't mean I can simply turn up for the exam
I prepared for 6 weeks fairly intensely. My preparation strategy may not work for everyone. If you need to get comfortable with some of the quant concepts you will definitely need more time to prepare. My concepts were fine for most topics so I just needed to get in to GMAT mode and do lots and lots of practice. Alright here goes..
1. I took 2 weeks leave from office which I was able to do as I had piled up my leave over the last 2 years and this time period was fairly chilled in our work cycle.
In these 2 weeks I did the OG from cover to cover. I would recommend you try and time yourself every time you work, like do a batch of 25 questions as they come at you in a fixed time period. If you're finding doing only the OG questions annoying then you can start mixing in some questions from Kaplan/ Manhattan stuff.
At the end of the 2 weeks I felt good about all the topics. I then took the first official Gmatprep test (Simulate it 100%, phone off, lock yourself in a room, use earplugs if you have, AC on, and take only up to the max time allowed for each break, simulate the time of day also if you've fixed up your slot).
On my first attempt at the official test I made the mistake of leaving my phone on and got interrupted with a few repeated calls from work. This resulted in me not being able to finish about 5 questions in quant and I got somewhere between 600 & 650. Don't let this happen to you!
If you like, you could maybe do a few sectional tests of other brands like 800score (which is what I used, they're ok) to get the hang of it before hitting the Gmatprep test. But I definitely recommend giving one of the official ones once you've covered all the topics as it will help to keep you on track.
For the AWA just go through this superb post sometime before you do your first full length test -
https://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html2. I was back in office for 3 weeks. During this time period I made a subscription to Gmatclub question of the day on my office id. This allowed me to atleast be doing 2 problems everyday and it just takes 5 mins to do them. I'm still getting the questions today and enjoy solving them.
After office hours, I tried to do either 1 sectional test or about 1 - 1.5 hours worth of questions. I was practicing questions from Kaplan and Princeton Review. The Princeton Review book I have has a few "difficult question" sets, so I only did those. The general Princeton Review questions are too easy for someone targeting a score over 700. I had heard that Kaplan is supposed to be hard, but I felt it was mostly ok. The really hard questions you kind of know won't come on the real test.
You could probably do a sectional every second or 3rd day with the others days used for practice questions, depending on how many tests you have and would like to do. Hopefully you're not travelling extensively or staffed on a murderous assignment

On the weekends definitely do at least 1 sectional per day (preferably 2), or you could do a full length test.
3. Last week before the test - I took off from work. Hardcore time now! Did the 2nd official test at the start of this week and got a 760 so felt really good.
I also did the Sentence correction questions posted in a word doc by Sondenso on the forum after this test. This is an excellent collection of questions and I would definitely recommend it to everyone ( I have attached a copy that I edited slightly with this post). Since the word doc's questions are sourced from the official prep tests you may come across repeated questions. Better to have them repeated in the practice doc than to come across a known question when doing a proper test.
On other days I did atleast 1 sectional test + practice questions. On the last day I did the Manhattan full length test (the free one on their site) midday and got a 720 which I felt fine with as I have seen most people score more in the real test than they do in Manhattan. After that I watched the movie
Catch me if you can
Slept at a reasonable hour and thankfully was able to fall asleep. Test day debrief in my next post..