Academic style isn't the same as writing a journal or a piece of
fiction. The best way to become familiar with this style and tone
is to read more formal content - newspapers, academic-based
magazines and newsletters etc. Many universities offer samples of
good quality academic essays. Reading is a brilliant way to broaden
your vocabulary and pick up useful style tips. You may dislike
books, but they are invaluable for skills improvement.
Examine the style, language, and level of vocabulary and grammar in
academic works. You won't spot any slang or smiley faces! When you
write an academic essay, don't write as you speak. That is, you
must follow certain norms in format and tone to make an effective
argument. The reader isn't one of your friends. He or she is
someone with an academic background, so write with your audience in
mind.