Sketchy Job offer potential??

[vipon]

I recently was browsing through monster and found an interesting job opportunity in a firm called Optiver . I applied and was instructed to go in for a mathametical assesment (basically an 8 minute test). If this was passed two more were given. Anyways, I know there are sketchy companies out there who recruit as many ppl as they can ie. Swifttrade.

The position is a Market Maker. What has me concerned, aside from the suspect webpage which seems to only provide information for employees, is in the job description:
"We prefer candidates with no previous working experience First, there are two things a Market Maker does not need: previous experience and a specific academic background."

Any opinions? Anyone have any idea as to what will be on the numerical testing?