RR e e a a dd y y o o uu r r pp a a pp e e r r a a l l o o uu dd . . Sometimes your ears catch inconsistencies that your eyes miss.
This is a very helpful skill. Reading aloud will help catch any flow issues or things you might not notice with just your eyes. I prefer my essays to sound like how I would normally speak. This usually helps me find where commas need to go or other grammar issues like that.