Hello Dazuco,
Yes, you can pass the GPEN exams if you purchase the books SANS provides for the course. IF I was unable to attend a class, I would advice enrolling in the SANS Self Study which includes the books and MP3 of the class. As you listen to the instructor on MP3 you can read and follow along in your book. All of the information on the test comes directly from the book your receive for SANS course.
http://www.sans.org/selfstudy/CHALLENGE THE CERT
You could also look at the course objectives study the material instead of purchasing the book. In our forum several members challenged and passed the GPEN course without the SANS training material. I would search the forums to speak with those individuals. Below are the course objects for each tool and technique tested in the certification exam.
http://www.giac.org/certbulletin/gpen.phpI hope the information can help you. I recently completed the 504 course. The info I learned in 504 class will help me in the 560 class.
GCIH - GIAC Certified Incident Handler : Passed my GCIH
