right-ho
i've always worked in adult services, but can give some general advice
as a newly qualified worker you will be expected to be bang up to date with all your law, policy, procedure etc. do swot up.
case scenarios most often test you risk assessment skills - prioritising work according to risk, allowing positive risk taking, criteria for statutory intervention. although your answers should be user-centred, don't forget to draw on the law/policy which informs your actions in each case.
in terms of the borough, different boroughs do have different challenges - different minority ethic groups, some of which may be hard to reach, different levels of homelessness, substance use, transient populations, asylum seekers, rural and isolated service users, traveller communities, how well resourcesd the borough is in terms of partner agencies, even the geographical spread of the borough and transport will affect how you work.
i've often had questions on time management, strengths/weaknesses, how i manage stress.
I am fairly senior but i don't know what a verbal analysis test is. some interviews involve a brief written exercise to check that you have the basic skills required for note taking and report writing.
SW interviews are generally quite nice though - none of the questions should be a big surprise, the interviewers will prompt you to continue if you've missed things, you can leave questions and go back to them, or ask for some time to think your answers through.