Free questions are a great way to gain exposure to a variety of content. However, there are a few things you need to consider when relying solely on free questions.
Firstly, CCRN instructors, or even people with critical care nursing experience, do not always write these questions. Also, they rarely have approval from any professional organizations like the American Association of Critical-Care Nurses (AACN). Therefore, you may need to be a little speculative of the answers and solutions, if included. A good rule of thumb is to answer the question and find your own justification why your answer is right or wrong.
Secondly, not all questions offer explanations when they give you the answer. Thus, you may miss out on a learning opportunity, especially if you do not follow up with further studying.