I started my home inspection business in Lexington, SC back in 2003. To answer your questions, yes, you do have to complete all the courses in InterNachi (14 in total). If you are on the website, go to your dashboard and click on the link in the left column listed as “Transcript”. It is there that you’ll see your progress on each one. And whenever you complete one, it will display as “complete”. You will have to also have pssed Nachi’s online inspector exam. Once you’ve completed all that, you be able to download your certificate of completion and that is what SC licensing board wants. The state website is llr.sc.gov Once you’ve sent your Nachi certificate of completion andd whatever else the state asks you for to them, they will send to you your “exam eligibility letter” which is what you will use to set up your state exam date.
And yes, the state exam NOW in SC is actually TWO exams ($90 total for both exams). One exam is the normal home inspector exam, the second on business management as you mentioned. That book you bought will help and they allow you to take that book with you into the state exam site(open book exam!) There are also some resource materials you may take into the exam relating to the home inspection exam itself. All the exam requirements and resources you need for it are found on the website psiexams.com