Hi Dave, regarding the above, I've been using the numerical reasoning practice test found at from the CEBGlobal URL link provided in the assessment centre invite email to practice the non-calculator maths test. In the practice test on CEBGlobal, it's 18 questions in 25 minutes.
In the actual test for the mental maths, I understand this is the same difficulty as above, but only 12 minutes for 25 questions of a similar difficulty? Also, I understand this part is non-calculator? This seems extremely stretching in the allocated time.