Build preparation around the actual route
Start with the vacancy, invitation and candidate instructions. Make a one-page map of every stated skill, behaviour or legal topic, then attach a truthful example or preparation task to each item. Keep the examples distinct so that you can choose the one that answers each question most directly.
For each experience example, note the context, your responsibility, the action you took and the result. Check that you can explain your own contribution, the information available to you and why you chose that course. Practise aloud until the structure is clear but the wording still sounds natural.
For a Law Commission team interview, use the areas of law and advance material named in the invitation. Organise the material around the central issue and any uncertainty. Prepare separate evidence for communicating and influencing, working together, legal research, legal skills and handling complex information.
For a Judicial Appointments Commission exercise, work from the current vacancy information because the process depends on the role and year. Prepare specific examples against every listed skill and ability. If the selection day includes roleplay or situational questions, listen to the full instructions, identify the stated facts and explain your response clearly.
Finish with practical checks. Confirm the location, start time, contact details and any documents you may bring. If your interview is remote, test the equipment, connection, camera and audio. Keep permitted notes brief enough to scan without reading from them.