Any advice or direction

Hello I am taking a Biology class online and my professor is blind (as I was told)he has an assistant that helps and the last 4-5 test we have had are not formulated to match the material given in our class/slideshows which is our only sources for answers. I have explained this to our teacher, sent emails all the above asking for his attention in the matter I’ve send screenshots of proof in the inaccuracy in the incorrect responses to my test. Also other students have expressed their same or similar issues but nothing is being resolved. I know it seems minor considering I have a B currently but any work I do or an A I can receive I want my A and I find this to be unfair to all of us. Including the teacher who I believe is unaware of his poor work ethnic assistant.. anyone have any advice? Thank you