Learning one language is tidy. Learning three at once turns your notes into a junk drawer. The question every polyglot hits sooner or later: keep a separate list per language, or one shared space?
Separate lists feel organized, but they hide the thing that actually helps you, which is the link between languages. The same idea often arrives in two or three of your languages, and seeing them together is what makes each one stick.
A better shape is one idea at the center with its words branching off by language. You study the connection, not twelve disconnected flashcards. The mess goes away because you stop pretending your languages live in separate rooms.