jordiporta.
Yes they use Jep charts. Airport is chosen on the day, you are given the chart and briefed on what is going to happen, then you have until after lunch to prepare and read the charts.
You need to know basic Aerodynamics and some info on the 737-800 e.g. seats, range, engines (please dont day Rolls royce),
some performance and Meteorology e.g. Jetstreams, Radiation fog, carb ice etc
Also you need to know as much as possible about Ryanair, and prepare an answer on why you want to work for them?