Translation of mediocridad

I thought it was great to hear from you. I would love to help you to learn Spanish. I'll write in English and you tell me the Spanish translation. I think that you're good enough for that exercise.
I think I have told you that I won't charge you for this kind of help. I looked at the sentences and I found them a little too long. They were good, but I understand why it took you so long and I think the point is too keep the shorter.
I have accepted you into my friend list, you have to accept me now too. Great! My goal is to have a good level in English, so that I can find a decent job in England or in the United States.