I started my postgraduate studies by learning about marketing and commmunication, which I validated with a Bachelor's degree. I felt like this wasn't what I wanted to learn or do professionnaly for the next 40 years. So, like my dad before me, I took a master's degree in computer science, which I am still currently doing today.
In France, you are able to do what's called an "apprenticeship" ("alternance") which allows you to have a professionnal contract with a company while still going to school, on some calendar-basis. I am doing my apprenticeship at MGEN Technologies.