Most final year undergraduate students have to write a project of 5-10,000 words and all Masters' students have to write a dissertation of 15-20,000 words. These longer pieces of writing require extensive preparation and test all your study and language skills to the full. For example, your time management, self-discipline, research skills and particularly your writing skills.
If you know you're going to need help correcting any longer piece of writing, plan for it! Work out when you're going to need it and make arrangements several weeks in advance. If you don't, you'll often find that nobody has any time for your dissertation, as they are longer, more substantial pieces of work and do need more time.
Projects and dissertations typically include all the elements of a report: