I took GPEN test at the end of February, and felt that the test exam is a bit more difficult than the practice test. If you are going to prepare yourself with the practice test, you could do it once. I did it twice, and found that the questions were reused as ajohnson said.

Make sure that you prepare with the contents of the materials. You will be fine.

 

  How could one apply for a researcher position there?

Good article from infosec institute!!
Is there any requirement to submit the article to infosec institute? Do you need to be a researcher there before writing an article?

A nice video tutorial set from securitytube.net,
http://www.securitytube.net/groups?operation=view&groupId=4

I'm quite sure you might like it  .

Well, it left blank wile I took a visit.