Think about the sort of things you use Access for, and work around that. Not knowing exactly the job spec, try the following for ideas:
* general relational database design/normalisation
* writing simple SQL queries or debugging ones with deliberate mistakes in them.
* drawing an entity relationship diagram
* Simple VBA code
* "Best Practise" in coding standards and following organisational standards.
* Interaction between Access and other applications (eg if you use Access as a frontend to SQL server or port data between access and Excel).
John