640 first attempt - planning to retake

I sat my first GMAT exam last Friday July 21st in London and this is my debrief. I hope this post can be useful to someone, and additionally I'd love some feedback on how I can go about preparing for my resit.

Very briefly: I am aiming for a 700+ score, something that I achieved in my practice tests, and so I was very disappointed to receive a 640 last week, a score that I instantly cancelled. In my preparation for the exam I have focused much more on Quant as this has traditionally been my weak point.

I have posted a detailed break down of my 640 score at the bottom of this post (courtesy of the GMAT Enhanced Score Report).

Materials:
- I bought the complete set of Manhattan prep books. The quant in particular I would highly recommend; the verbal books were OK, although I have been quite strong in this area to begin with.
- I also picked up the Manhattan Advanced Quant textbook. While not essential reading, I found this very helpful in forming an 'attack' strategy for questions, focusing on 'hacking' particularly tricky questions rather than simply working through a traditional method to arrive at an answer.
- I can't overstate the usefulness of GMATClub - both from the online question banks and forums to the downloadable PDF 'GMATClub Math Book'.
- I also had access to the Veritas practice exams and questions banks, which I did not utilise too much.

Strategy (or lack thereof):
- My aim was mainly to work through the full suite of textbooks (quant and verbal) taking practice tests as I progressed.
- I worked through a large number of GMATClub question banks (my Workbook informs me I tried 691 Verbal and Quant questions on this website !).
- Altogether, I took 7 practice tests (4 official GMATPrep tests and 3 Veritas).

Practice results (by date):

GMATPrep 1 (Feb 2017): 640 (can't get breakdown of Q and V scores from GMATPrep software - any pointers?)
GMATPrep 2 (Jun 2017): 690 (Q 47, V 38, IR 8)
GMATPrep 3 (Jul 2017): 720 (Q 47, V 42)
GMATPrep 4 (Jul 2017): 660 (Q47, V 30-something, again I can't get V score from the GMATPrep software).

Veritas scores are below. Honestly, I found it hard to 'motivate' my self properly for these, and I didn't put too much emphasis on the absolute scores I received, instead using them as practice for fatigue, timing etc.

Veritas 1 (April 2017): 600 (Q 37, V36)
Veritas 2 (Jun 2017): 590 (Q37, V34)
Veritas 3 (Jun 2017): 640 (Q 44, V34)

Real GMAT exam 21st July (London):
- Overall 640
- Verbal 41 (94th percentile)
- Quantitative 36 (31st percentile)
- IR 5 (55th percentile)

Some further detail on my Quant score, which clearly requires the most work:

- I chose the order: Quant, Verbal, IR, Essay.
- Problem Solving: 25th percentile
- Data sufficiency: 43rd percentile

- Arithmetic: 48th percentile
- Algebra/Geometry: 10th percentile

The ESR stated the following: "You responded correctly to 71% of the first set of questions, 43% of the second set of questions, 29% of the third set of questions and 43% of the final set of questions..
The average difficulty of questions presented to you in the first set of questions was Medium, the average for the second set of questions was Medium High, the average for the third set of questions was Medium and was Medium for the final set of questions."

"The average time it took you to respond to the first set of questions presented was 2:13, the average time for the second set of questions was 2:14, the average time for the third set of questions was 2:24 and 1:31 for the final set of questions."

An observation from the ESR is that I am spending a significant amount of time on quant questions I get incorrect (over 2.5 minutes) versus questions I get correct (less than 2 minutes) - is this an issue?

It seems obvious to me that something went pretty drastically wrong on test day in my Quant section. Additionally, I'm amazed at how badly I scored in the "Algebra/Geometry" section (10th percentile !) Nervousness was certainly a factor, as was going in 'cold' (i.e. I will definitely practice a couple of questions before beginning my next test).

Any comments or pointers would be greatly appreciated as I go about preparing for my resit.