Final answer:
Park's primary issue with the study material is the lack of adequate coverage of topics tested on the exam, such as inventories and taxes.
Step-by-step explanation:
Park's main complaint about the third-party study material is that it did not adequately cover the topics that were tested on the exam.
She mentions that she found herself unprepared for specific questions, particularly on the analysis of inventories and taxes, despite using the study material to supplement her learning. This indicates that there is a mismatch between the content provided by the third-party provider and the actual exam content. Park feels that the external material led her to focus on certain topics while neglecting others that turned out to be significant in the exam.