Studying for NLN Pharmacology Challenge Exam

[SailorVee93, ASN, RN]

Hi all! I'm currently attending an RN-BSN program. One of my courses regards Pharmacology. We have the option to either pay to take a pharm class or pay to take a challenge exam to earn the credit for pharmacology. I would rather pay under $100 for an exam than over $1,000 for a semester. I have been trying to find ways of studying for this exam online. Apparently there are no official study guides from the NLN (or other book companies). The study guides I do find are unofficial ones posted on StuDocu or similar sites.

I'm just curious to know if anyone has had to take this challenge exam? If so, how did you study/prepare for it? I only want help/guidance, no test questions/answers and no spamming of shady websites asking for money for study guides or test answers. Any and all information is greatly appreciated! Thank you in advance!