Girlfriend and I impulsively bought non-refundable one-way flights to Buenos Aires. When I was there five years ago, I spoke at an elementary level. Best way to re-learn in 5 months? I’ve been trying Duolingo but it’s honestly way, way too slow to recognize where I should “test into.”

I get a feeling I should tackle vocabulary or use a Spanish textbook since I think I should get started with brief review of different conjugations/tenses, and study by topic (more than four new words at a time).

Any advice?