Start by gathering all of the similar papers and essays.
Read through all of them carefully, taking note about how they present their facts and opinions. Observe how the writing flows from one part to another.
Think about how you would write about the same topic and compare how your own writing differs from the others.
For essays and articles that stand out, observe the writing styles and determine how you can emulate them in your own writing.
Let a friend read what you have written and let her point out relevant mistakes and how you can improve your writing.
Consult with your professor. Ask why you received certain grades for papers you wrote and discuss improvements you can make.
Try improving your previously written essay, taking note of the feedback you received. Check and compare your rewritten work with the original one.
Choose a location to write that is free from any distraction.
If you are writing with the use of a computer, turn off messaging applications and other programs that may keep you from writing. If you are not making use of Internet references, you can go a step further and disconnect your computer from the Internet.
If you are not expecting an important call, put your cell phone in silent mode and put it some place where you cannot see it.
Read books, style manuals and Internet articles. There are so many resources for writers of all levels out there.
Join different writing workshops and symposiums in your college. These are usually arranged by different college organizations or by the college itself.
Talk with other writers, especially notable writers in the field. Find out their work flow, their habits and how they handle various problems they may encounter in their writing.