CNA -STAT HELP about a simple question, please.

I started a CNA class that started Aug 17 and ended September 24. This teacher gave us wrong facts about many things through out the class and constantly scorned  me even when I did things correctly. BTW, She did no other students this way. Even the ones she heard talk badly about her.  She shun me when I had a question. I think she shun me because I questioned her information when I thought it was incorrect, but so did others in the class. She attempted to make me feel stupid every time I was in her class. August 24th, last day of class, we did 5 skills with her that we needed a 85 above to pass and if you didn't do everything her way, she counted off points.  I got through it, she counted off things that I did and the person over the place passed me. After I told her I've worked as a CNA in the past, she said she worried about me being fast enough to keep up in health field because the work pace moves fast. I took it as an insult because I told her I've worked in the health field.  After all that ranting, It's time to ask my question. I want to gather all my items for the skill, then knocked, say my name, and explain skill.  She's says it's wrong. The teachers says knock, explain skill, ask if it's OK, then gather the supplies. I get confused when I stop in my skill, gather my supplies, and go back to the skill.  I wouldn't think it's right because you left the room to get supplies and would have to reenter the room.  What is your opinion?  My test is on October 12th. so I really need help. One last thing, I had a 97 average on my written test at the end of the class and the skills part was the only way she could make a impact on my grade.