An assessment centre is a method used in the applicant selection process. During group assessment centres, applicants spend one to two days completing individual and group work. You will be observed and evaluated as you complete assigned tasks. The goal is to assess your suitability, skills and competencies for the position and identify the ideal person for the job.
You are evaluated based on pre-determined criteria.
It makes sense for you to consider which requirements are likely relevant for the business and position.
Both individuals and groups can be asked to roleplay - the individual roleplays are usually significantly shorter.