710 is a decent score and probably sufficient for MIM programs. If this were for MBA, then you would need to consider several other factors since you would have much more competition.
Re: the poor quality of the pens. Can you try to raise this issue with GMAC? Too many testtakers are having to deal with poor exam conditions. It is high time something were done about this issue.
Re: blurred eyes and possible need for spectacles. Well, you should know before you go to the test whether you have need for spectacles, or am I missing something? And yes, please put eye drops much before the test as they will hinder your vision.
People should not underestimate these supposedly external issues, including anxiety which can be both helpful and can detract, on test day. Cheers.
Posted from my mobile deviceI will definitely try to take up the issues I faced at the centre with GMAC/Pearson.
As for the blurred vision part, I have not used my eye drops since the test and my vison seems fine.