Hi mate, I don't really know what to say. But to agree with what you said, speed is very important as well as accuracy. I thought I'd done crap but I must've been ok.
Could you practice your maths before you go? There might be some free online problems similar to what you might get asked in the assessment. Good luck!
Could you practice your maths before you go? There might be some free online problems similar to what you might get asked in the assessment. Good luck!