Everyone says that GMAT isn't a maths test, but a lot of them have quant or engineering backgrounds. Sure, it's not a maths test if you have a certain level of mathematical fluidity to begin with, but if you don't... Well it's still partly a maths test.
My background wasn't totally dissimilar to yours in that I'm older (31). Despite having a STEM background, a lot of the math in the gmat was very new to me because the math I'd done in school was extremely pure and heavily focused on calculus and alegbra. Many of the concepts in the gmat were entirely new and if not, extremely rusty.
The problem with lack of fluidity in maths is that when faced with a type of problem you've not seen before, you don't know how to solve it, and freeze. For me the only way around this was just slogging my way through a lot of quant problems. I like the gmatclub test bank problems.
Two weeks make a big difference for me - I was able to bump from Q47 to Q49 but what's not reflected in that score was how much less stressful I found the exam. The first time I freaked and had to guess loads. The second time there was only one question I truly was stumped on - the second question in the exam! (I realised the answer later, and I definitely got it wrong).
As well as gmatclub, math revolution system for DS is also useful.
However, it's important to know when you're reaching the point of diminishing returns in quant. IMO it takes LOT of work for people of our profile to raise our quant scores. I probably put 10x the hours into quant than a did verbal and had to do a lot of extra work to get from Q47 to Q49.
As an arts major, I would try and improve your verbal. For me it didn't take many hours extra study and a lot more calm to go from v41 to v47 and a few points up in verbal will have a massive impact on your overall score. Do you know what your verbal weaknesses are?
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