There's definitely a resources gap.
We live in Germany and German isn't my first language - in fact although I work in German and pass as fluent in everyday life, my spelling and grammar is about the same as my 8 year old's
so my children should be disadvantaged.
I'm pretty sure they aren't because they have a PC each, we have a printer and plentiful paper and toner and a scanner, we have fiber optic broadband and I switched to late and night shift so as to be present during the day to supervise their home learning. I've been sitting with my dreamy unfocussed 8 year old and structuring his days, downloading his timetable, finding learning videos to explain the German spelling rules around long and short vowels which I didn't know myself, learning to conjugate verbs in the different past tenses with him, testing him on his spellings, listening to him read, doing the reading comprehension with him etc. etc.
I've been helping my 12 year old structure the project style work and discussing with my nearly 15 year old how the constitution of the Weimar Republic was flawed and how far it contributed to the rise of national socialism...
I used to teach in the UK and some of my most successful students were second generation Chinese or Indian British or Eastern European with parents who didn't speak fluent English... Having the community language as a first language isn't always the advantage some people hope it is!
Parental education and expectations and resources at home make the difference.