My dear students,
I'd like to introduce a new way to work on your writing. If it works, it will be fantastic.
After some time working on this, Cambridge University Press have come up with a great tool to assess your writing. All you have to do is sign up (you can also use Facebook for that), choose the exercise and submit it. You'll get instant feedback about how to improve your writing, which you can resubmit to be reassessed. I think it's a great idea.
Try and do let me know if it works for you.
Here's a video explaining how it works:
And here's the link to go:
Good luck and enjoy your writing!