https://www.slab.org.uk/faqs/step-8-case-selection/
We will pick 20 cases per topic (Housing, Welfare Benefits, Money/Debt) from your completed Case Selection Grid. You will then be asked to provide a description of the case matter, confirmation of whether the case is open or closed and what competences are covered in the case.
Type II and III cases are assessed in exactly the same way. The 20 cases are a random selection of your advice work in that topic - they do not need to cover every competence your agency gives advice on, for example all 15 Housing Competences.