Feeling unprepared for PhD because of poor educational system in my home country. Should I leave PhD to retake courses somewhere else?
In the European programs I have been involved in, there is no (or a very minimal) fixed curriculum students need to go through. However, students do follow specific courses to learn specific techniques. Typically/ideally the student discusses with her/his advisor what is needed for the project, what is needed for her/his future career, and where the gaps in her/his knowledge is, and how to fill those gaps. This is the kind of discussion you need to have with your advisor.