How they check the books for exam?like in what pattern. Is writing some tricky scenarios with answers allowed in the book ?
You may not write sample questions and answers. You may markup or write additional information to the info in the books.
I personally did not have a lot of written information/notes. I added some info to the existing diagrams. If there was a diagnosis guideline, I referenced what page the guideline was in the chapter section. I put tabs on the chapters. Maybe a total of 2-3 hours "prepping" my books for exam. I know some students spend days.
From AAPC's Exam Certification FAQs:
https://www.aapc.com/certification/faq.aspx
Handwritten notes are acceptable in the coding books only if they pertain to daily coding activities. Questions from the Study Guides, Practice Exams or the Exam itself are prohibited. Tabs may be inserted, taped, pasted, glued, or stapled in the manuals so long as the obvious intent of the tab is to earmark a page with words or numbers, not supplement information in the book. Altering, whiting out, painting, or printing over any pages within the code books (e.g., marketing pages, table of contents, reference pages, etc.) to supplement information is prohibited.
No materials (other than tab dividers) may be inserted, taped, pasted, glued, or stapled in the manuals.
I will note some proctors examine the books more carefully than others. I have heard stories where the proctor simply turned the book upside down and shook it to ensure no additional pages were in it. I have heard stories where the proctor looked over all written information and took the examinee's book away and gave them a different, new book and the examinee was not allowed to reference any of their notes. It might not hurt to reach out to the chapter officers where you will test and ask if you have a specific question.
Good luck!!