I second memrise. I also suggest apps like Anki (which is free for desktop or Android) and Quizlet for studying vocabulary. https://apps.ankiweb.net/ https://quizlet.com/ But, honestly, one of my strongest recommendations is to sign up for Netflix or another streaming site. One of the quickest ways to improve spoken English and listening skills is through watching movies and series (with subtitles in English only!). This is always one of the first strategies that I recommend to my students when they ask me how to improve their spoken English quickly. It may sound strange, but I really do think that this works. You will quickly become quite familiar with the way that native speakers communicate, and if you can find a good series that you enjoy, it won't even feel like work. Learning is the most effective when it is fun and enjoyable.

https://www.memrise.com/ Hi Pedro, Some of my students have used this site in the past for increasing vocabulary.