FSI Portuguese

The FSI Portuguese [Foreign Service Institute Portuguese] course is a free course by the US government made around the 1965's as a language service for soldiers soon going to a country where they would require to use that language. It focuses on heavy repetition as a way of drilling the material into your head. Whilst repetition is a good method, it is possibly the most mind-numbingly boring method on the planet. I am on unit 11 out of 48 and I still have 'os carros' being drilled into my head despite it being introduced 7-9 lessons beforehand. Having the material continuously reinforced for 2-3 lessons is understandable but 7-9 lessons afterwards is a bit extreme. But that's not all, anytime I re-enconter 'os carros' it is not said once, but anywhere from 2-4 times. It's a very unfulfilling course to work through but I must admit that I have saw improvements through it, in particular with my listening skills. The problem is that it is becoming very hard to motivate myself to study Portuguese as it is the only course I can properly follow. There are barely any affordable courses out there for a broke student who get £10 per week to spend leisurely. I know that as boring as it is, it will allow me to have a good base to build upon but the question is can I really finish it if I'm having difficulties motivating myself less than 25% in?