50 Articles for Forum

I need a content writer for my Forum to write 50 sets of 500-word articles. The subjects of these forums are general in nature mostly for students courses ie exams/board exams like Math, English,? Science, TOEFL, GMAT, MBA, GRE, accountants, doctors, engineers and other professional exams. Prior experience required.? Should be really good in English and knows correct grammar, punctuation, when to use upper/lower case. Please don't bid if you have problems constructing your sentences. Strong attention to detail is required. In your bid, you need to say "I am an expert content writer from" then add the Country where you came from. If you can follow this direction then that means you read my requirement and you passed at least the basic 'detail orientation' test. I will decline all bids the doesn't follow instructions. Thank you very much.