The group exercise was to see how well you work in a team (Not neccessarily lead)
The Technical test had a few basic questions covering reaction forces, second moment of area, pressure beneath a slab etc
Interview - mostly competency based questions with a couple technical - how to make sure concrete has been poured properly for example (check for honeycombing, follow BS & Eurocode standards etc)
Individually, we were given 45 minutes to compile a 10 minute presentation on why leadership and the ability to influence and motivate are important qualities for engineers to have.