Learning German from Apps like Duolingo vs learning from German Language School
Its never bad to learn the language from apps like duolingo but the only problem is that with this app you wont be able to learn the grammer although you’ll get a feel of it using the apps.
I know one of my friends in Germany just learned German by speaking with friends and he wanted to apply for some visa process but didn’t had any certificate. So he directly went to a language school and gave the German language exam where they found his language speaking skills as C2 and writing skills as C1. So that’s also a possibility.