Please help me have a look at it "In getting a job or advancing in one,the ability to read and comprehend quickly can mean the difference between success and failure."

What the "advancing in one" means?

Maybe you can help me check it It's my first time to write an article here.Today I have played an interesting game named "getting over it".It is a game that you control a man in a pot with a hammer to get over the obstacles and lift you up.It really is hard for me to finish it and I get so mad about it and even want to break down my iPhone.But later I learn that there are many other people like me with a poor control,and I feel better now.