In a course of legal studies at the university and in some classes of the law school, you may be required to write a research paper that addresses a legal issue. These trials can be complicated because the law is constantly evolving. To ensure a good grade, your essay must be well researched and reasoned consistently. With proper planning and research, you can write an excellent legal essay. Note: This article shared by UK Writing Experts, does not address how to write essays for law school exams or bar exams, which require different techniques and strategies.
Read the test set carefully.
Your teacher will provide you with a set of instructions or instructions on the content of your essay and how it should be formatted. Your teacher may ask you to research and answer a specific question or give you the flexibility to choose your own sub-topic within the overall course topic.
A narrower test slogan might be “Discuss the evolution and impact of the evidence exclusion rule”. A broad slogan could be “Discuss how a civil rights movement led to changes in federal or state law.”
If you are invited to choose your own topic, your teacher may require you to submit a written proposal or sketch to ensure that the topic you have chosen is in compliance with the slogan. If you are not sure if your topic is within the parameters of the slogan, propose your topic to your teacher after school or during the hours you are in your office.
Read any required material
Sometimes a test slogan will require you to read and write about a particular book or set of materials. Before deciding on a test topic, read any assigned material and check your textbooks and class notes.
Each student prefers different methods to get ideas. Try writing a list of ideas or creating an “idea map” by circling your topic in the center of a page and writing new questions, arguments, and data branching out from the central theme. 
Hopefully, the readings, classes, and discussions of your course will give you enough background knowledge to choose a topic. If not, check your class notes and explore online for additional background information.
It is not uncommon to change your subject after researching a little. You may end up narrowing down the questions your essay will answer or changing your topic altogether.
Choose a test topic that is of interest to you.
It will be easier to write about a subject that matters a lot or that you are curious about than one for which you do not have strong feelings. You will be motivated to investigate the problem thoroughly and enjoy the writing process more.
If you can, try to focus on an area of the right that affects you. For example, if your family is involved in agriculture, you may be interested in writing about the rules of water use.