The exam has a 3-machine AD chain worth 40 points. You can practice this for free using —a free, open-source script that builds a vulnerable AD lab on your local VM.
: Downloadable VMs to practice hacking machines, often accompanied by free write-ups. Hack The Box (Active Machines) oscp pen200 free
Study the OSI model, TCP/IP, and common ports (80, 443, 445, 21, 22). The exam has a 3-machine AD chain worth 40 points
A free tier designed to teach the fundamentals of pwnage. and common ports (80
There is no legitimate way to get the PEN-200 certification or take the exam for free. OffSec is a commercial entity, and the "Proctored Exam" is their product.
Finding a comprehensive "free" write-up for the OffSec PEN-200 (OSCP)