There’s not really any specific advice people can give as the assessment changes every year. When I did the test it was on allocation and plea before venue for a specific offence. It also depends whether you’ve opted to go down the crime route or family, as the question will be tailored.
You should receive something about a week before your assessment which will assist in narrowing it down.
Generally speaking, you’ll be asked to advise the interview panel on whatever the assessment topic is as if you were a legal adviser in court. Be sure of your advice but be ready to say “I’m not sure” - a good legal adviser always admits that and says they need to check rather than guessing or giving inaccurate advice. Be clearly spoken and maintain eye contact.
You’ll be asked some competency based questions and strengths based. My only advice is to make sure you have multiple examples of each competency they identified in the application as quite often people come with one, which doesn’t fit the question, but they try and force it to and it doesn’t work.