I started my preparation in January 2017, bought OG 2017 + verbal and quant review.
I did Diagnostic test, which showed that DS and CR are my weakest points. Taking that into account I've made up a sort of prep strategy.
First, I've ordered complete new
Manhattan Prep-set 6th edition on Amazon. And you can't even imagine my anger when they sent me used 5th edition....
Second , then I discovered GMATclub, and become a member of this wonderful community

))
Third, I started watching free videos of amazing Ron Purewal.
My preparation dragged for 6 months due to multiple business trips during which I had to give up preparation process.
I took GMAT on 10 of August in Moscow, and scored 620 (Q46; V29)
During my prep, my score had never fallen below 640.
I did 3 mocks, with the following scores:
GMATprep 1 640 (Q45; V34) - in April
GMATprep 5 700 (Q49; V37) - in June
GMATprep 6 690 (Q49; V36) - in July
After official exam, I decided to order Enhanced Score report and it showed the following:
PS - 41
DS - 49
RC - 25
SC - 27
CR - 41
I've concluded that those sections of GMAT that I feared the most, I actually did decently well, I mean DS and CR.
During my prep, I paid much greater attention to those sections, and underestimated my skills for others, and I do believe that this is the reason why my score is so low.
Nevertheless, I was accepted to Warwick and I do not need to retake GMAT again.
P.S. When I saw 620 on the screen I was astounded and frustrated...I thought that I was really well prepared and able to score at least 680. But GMAT is a tricky exam and this anxiety before the official test, and lack of sleep made an impact.
Despite the fact that I am of those lucky guys who scored 700+ from the 1st attempt, it was a great experience all in all.
I want to give special thanks to
Bunuel for your major contribution to the GMAT community, you're doing really great job for thousands of GMAT takers.
Maybe I decide to retake the test later, I don't know, just to prove myself that I can do more.