Do plenty of prep before hand, the questions aren't hard but it's definitely worth a look over! It is also important to be open, friendly and enthusiastic. The training scheme means you can pick up any technical knowledge you need so their real focus is on hiring those with great inter-personal skills and an ability to learn fast. The technical and business pathways are assessed together but not ranked together meaning there is no need to panic about not knowing all the technology ins and outs.