For the 'How will it aid you?' question, you could talk about what I said earlier.
For 'What are your expectations..?', you could say something like 'I hope to have the opportunity to speak to doctors as they will be able to provide me with knowledge of the NHS and also of what being a doctor is like.'
It sounds similar to the answer for the other question but I'm not entirely sure what to say! The questions are basically the same (':