For vocab, there are basically 2 methods (or a combination of both). 1. Use Anki >faq Anki in #botchannel 2. Read. Either read voraciously, choosing text you can understand (between 70 and 90%), or put the vocab you encounter into your Anki deck/s.
#Vocab?
viral iris
If you're into music, you can use lyricstraining, but unless you're willing to do all the levels, looking up words you don't know (ca. 1 - 2 hrs per song, to my knowledge), you'll also have to put new vocab into Anki.
Best ask about that in #general - I'm sure somebody will know. ;)
terse elk
You might also check out "studysmarter". That is an app which I have been using for years and for very different subjects. And I think it's easier to use than anki.