Hi Aos
You can find the types of questions they will ask here at your assessment.
www.benefitsandwork.co.uk/help-for-claim...r-medical-assessment It is not an exhaustive list so be aware it is possible they ask you something you're not expecting, Try not to let this upset you when it comes to it. It's not a trick, but sometimes it's just a question that is personal to the evidence you have given.
On average the assessment is about an hour and a half. If you're able to have someone with you do so.
BIS