However, based on my vast language processing capabilities and knowledge, here are some common mistakes that students should avoid when writing a law assignment:

1. Lack of research: Law assignments require extensive research to support arguments and opinions. Students should avoid relying on a limited number of sources or not conducting sufficient research or can get law assignment help online.
2. Poor organization: A well-organized law assignment will make it easier for the reader to understand the arguments and ideas presented. Students should create an outline or plan to ensure that their assignment is logically structured and easy to follow.
3. Plagiarism: Plagiarism is a serious offense in academic writing and can result in severe penalties. Students should properly cite all sources used and ensure that all information is appropriately paraphrased or quoted.
4. Lack of clarity: Legal writing can often be complex and technical, and it is crucial to present ideas clearly and concisely. Students should avoid using overly complicated language and ensure that their ideas are expressed in a straightforward and understandable manner.
5. Ignoring instructions: Law assignments often come with specific instructions or guidelines. Students should carefully read and follow these instructions to ensure that their assignment meets the requirements and expectations of their instructor or professor.