Hey guys, thanks for all the replies. I am white male from the UK, and job is with ACN. I have an undergrad in Economics from a red brick university in England, but not elite tier.
I think I will be retaking for reasons above, have a lot of time and I understand basically every maths question, it's just implementation and timing, I finished all the questions but was quite often answering very quickly to make up time. Will check out the courses recommended, my only study for this test was completing all the official gmat hard and medium questions from the 2018 guide (plus the two practice tests.)
For anyone who pm'ed me about the verbal, I'd love to help but think I'd be useless. I didn't prep at all for verbal bar the practice tests, and CR and RC I just can kind of figure straight off by reading the text (haven't actually ever dropped a point on these two #brag). The sentence correction I have absolutely no understanding of the official gmat reasoning for what's right or wrong, but tend to just read the sentence in my head with all the options and get it by process of elimination. Not sure why I can do the verbal so well and the maths so bad, but I have read constantly since I was a kid, and last five years I effectively ran my own business within which critical reasoning and kind of abstract thinking was really crucial, so have been used to making arguments and trying to second guess how people would attack them.
Hopefully will post here again in Dec with a much improved maths score!