The atmosphere can be formal. Free form A loosely-framed interview around a few topics. It is unstructured, informal and can be perceived as a cosy chat. Beware, it can be difficult to sell yourself without being prompted by relevant questions. It is still a testing situation.
Presentations Prepare well and practice.
Keep it simple. Psychometrics You will be asked to respond to a series of questions by selecting an answer from a series of options. Psychometric tests are becoming increasingly popular in recruitment but only in a supporting role. You can't really prepare for these tests. Some have built-in lie detectors.