TL:DR: Future applicants, try to figure out what your target score should be before studying/re-taking/consulting a gmat tutor. Save yourself needless effort! It might be helpful to casually reach out beforehand to your intended uni(s) and/or their alumni to get a feel.
The GMAT is truly a global exam, with a total score out of 800, individual scores in different sections, and is something that has changed over time (i.e IR section/Online etc). It is an exam taken by people literally all over the world from all kinds of backgrounds for universities all over the world. In some ways this is great, but in some ways perhaps less so.
One way this can be a problem is that this makes it hard for any one person to know what EVERY adcom committee in EVERY country for EVERY specific program is looking for. If such a document existed that listed all that info in detail and was current it might be worth more than it's weight in gold.
It really boils down to this kind of thing: Do YOU given YOUR background actually need that Q49 (or does your intended uni give you a pass on this because you have a degree in Maths/physics perhaps)? Would a Q47 do? Does YOUR uni really give a huge preference to a 760 over a 710? Or would doing a small, fun project that makes your application shine make up the gap and then some? Does some English exam you took in the past take the edge off that Verbal score that was a bit lacklustre?
Rather than grind yourself to the bone trying to get a higher score than you really need on the GMAT that is taking months and months of study...maybe you could quickly take a language test online for that second (or third) language you already know. Maybe there is a hobby you used to do during your free time that just so happens to be looked on favourably by YOUR intended uni(s).
Before studying for this test (or re-taking/contacting a tutor), consider doing a bit of research beforehand (it may just take one afternoon!) as to what total score out of 800 (and individual section scores) your intended uni(s) look at. Try to figure out - why not simply give them a casual call/email during your tea break or something - what the uni is looking for specifically:
Is it simply a bare minimum to "check" that box on your application?
Is the uni actually very interested in a high total score for global rankings (and has a particular focus on the Quant?)?
Do they actually care about the IR section? "Do you all take people with IR scores of 4?"
What's their take on the AWA? "Would I have to re-take the whole ruddy thing if I got a 4/6? Can I easily prove my English ability in a different way? Oh, sweet, writing an article for my local paper?"
Some tips that may help:
Casually reaching out to your intended uni(s) beforehand (Check out their website)
Finding alumni (perhaps on some forum) and perhaps reaching out to them . "Oh, the gmat score the uni is looking for? haha, I was there last year and NO ONE had a Q50. Only 1 in 3 had a Q49 if I had to guess."
All the best and take care
A GMAT Tutor in England...wondering if a certain document exists.
www.gmatknight.com