You can certainly get all 31 quant questions correct when you take the GMAT.
To do so, you need two things.
- You need to be skilled in all areas of GMAT quant.
- You need to be skilled in working accurately.
That's it, because here's the thing. The quant questions don't just keep getting harder and harder as you get them correct. Rather, they get harder for a while, and then the average difficulty stabilizes, and you get some rather hard questions mixed with medium-hard questions.
Here's the quant portion of the ESR for a GMAT on which the all quant questions were answered correctly. You can see that the average difficulty of the questions stabilized and then even decreased a little.
For some tips you can use to achieve perfect accuracy on the quant section of the GMAT, see these posts.
Improving Your Accuracy on the GMATHow to Get a Perfect 800 GMAT Score