As was already mentioned, your resume is pretty sparse. To flesh it out some, maybe a brief description (more than one word, as you have) of your technical abilities in Mathematica, MatLab, etc. would be helpful.
They are probably looking for someone with skills other than technical skills, such as personality traits that they're looking for. It would be beneficial for a lab monitor to be able to listen and understand the problem that someone is having with some computer software. The job will almost certainly require a certain amount of patience with students who are not used to being able to accurately describe the problems they're having, so if you can address that, it might help your cause.
Being able to explain something in more than one way would also be a desirable quality. Sometimes students just aren't able to follow an explanation. Being able to explain something in a different way might be enough to get the idea across to them, while merely repeating the same explanation again probably won't help.
How was the job described? Are they looking for specific skills, experience, and personality attributes? If the job description describes the ideal candidate for the position, make sure you write your resume so that you address as many of these as possible.