DU LLM entrance exam will be conducted by National Testing Agency (NTA) in between 2nd-9th June 2020. For the same registration process was scheduled to start from April 2nd but as of latest updates it has been postponed until further notice due to outbreak of pandemic named COVID-19.
Just wait for the application forms to be released by the authorities. After starting of application process you can fill it through official website of DU as given below
Official website :- http://lawfaculty.du.ac.in/index.html
I hope this answer helps you. For further doubts feel free to ask in comment section.
All The Best!!