Is there proof reading software?

Hello, I am just starting out in the medical transcription field. I have some medical backround and I went to an interview today where the owner is willing to give me a chance to see if I can do the work. He gave me a microcassette to type and will see how I do. I really need this job and I think he saw that and was willing to help me out. I am so hopeful about this. My question is do they sell proof reading software to check for grammer errors? I am not the best when it comes to proof reading and I know that the ultimate goal is to get the work done as efficiently as possible but to also have as little errors as possible. Also, what books does anyone recommend I get for reference for medical terminology and what type of PDR is best? If anyone who is experienced can give me some advice I would really appreciate it. Thank you so much!! Jenny