The National Home Inspector Exam is created by an independent body that is not affiliated with InterNACHI. We do not know what is on that test and cannot guarantee that students will pass the exam.
We always recommend that inspectors who are taking the NHIE take advantage of the preparation materials on the NHIE site. Those can be found here: https://nationalhomeinspectorexam.org/prepare-for-the-exam/
The NHIE website also gives test takers a list of topic areas that may be covered within the exam.