Welcome aboard ! The exam is pretty hardcore I thought but if you understand all the concepts enough and practice in the VPN labs, you should be able to get a passing score. It sounds like you have solid linux and networking experience, but PWB is a highly Offensive Attacking course. How are you pen testing skills? Have you used Metasploit, are you familiar with nmap, do you know how to perform Web App attacks, privilege escalation? Though the course will teach most of these, it's best to have experience doing/using these prior to walking in just to make sure your comfortable. What I listed off was of course a minor subset of the topics you'll cover.
I would even say just practicing as much as you can that is inside the PWB syllabus with VMs for a little bit would help you out. Lab time is so precious in the course. Being unfamiliar with some tools may take away from lab time when your having to research them. I would highly recommend going with the 90 days lab access just to make sure your fully prepped for the examination.
You don't need to be a good coder but even understanding the basics helps out. Dynamik's link is great to get you started with python, there's also this useful thread
. Another great resource for you would be the OSCP Section
here on the forum. This is great because there's 4 pages of information of folks who have taken the course, are getting ready for it, and have wanted similar suggestions like yourself. Here is my PWB v3 Review
- I think it's a great read because I listed off some of my background prior to going in. Cd1zz's Review
is also great.
Ultimately my main advice is although you fit the pre-reqs, I would get well familiar with the syllabus before officially signing up. Setup your own lab and practice in it! Learn some python. Purchase the 90 days just be make sure you'll be well prepped, and prepare for some pain (: