Translation of mayday in Spanish

I usually charge 15 dollars per hour, but I don't care very much for the hourly system. I can also help with corrections and suggestions, but only if the original text is a serious translation and not an automatic one.
Please explain me the exact differences between British and American .... This year I'm trying to make the TOEFL. We can then discuss how we can prepare for this exam. I failed the first time.
I am 30 years old, I have a 3 year old son and I am married to a Spaniard. I work in a bank - for more than 4 years. I really love my job very much, because I love working with people.