Questions relating to basic understanding of object oriented programming so questions like what is a class and what is an object/instance. Good to know the 4 concepts of OOP: inheritance, abstraction, polymorphism, encapsulation. Can expect other basic programming related questions like the try, except, final statements and difference between the words except and exception. Finally, definitely expect some SQL questions. Depends on the time you will have left so SQL questions are pretty basic ones like joins, unions, etc but can ask complex ones like about multiple joins if there is time left.