It is not always necessary to prepare in advance, but For example, if you wish to focus on referencing skills for an upcoming assignment, it may be useful to bring a printed copy of the assignment to the appointment. Your assignment does not need to be completed ahead of the appointment. A draft, a plan, or brainstormed ideas can help your LDS tutor advise you.
It may also be useful to bring feedback from previous assessments, but this is not necessary. You might also wish to think in advance about general or specific questions to ask the tutor.
Remember, each appointment lasts up to an hour, so it is important that you have a clear and realistic target for what can be covered in this time period.