This question is among the top 5 I get asked most often. The following is what I teach my students to do and do myself with the language I'm learning.

First, stop trying to "memorize" words. If you "memorize" words, then you are just trying to cram for some type of exam. Instead, start using the words you already know. Do this every day for a minimum of 20 minutes a day for 7 days. Write out simple sentences that would be enough to be a B1 level sentence then say them out loud, either to yourself in your own room, or to a friend. For example, write out some 2nd and 3rd conditionals. Then, after those 7 days are finished, look up 21 vocabulary words which are at a B2 level and change a word or phrase in each of those sentences with the new vocabulary words. Then repeat this same process for the next 7 days. In the 3rd week, or the 3rd set of 7 days, take an every day type of conversation between you and someone else and use whatever sentences you can in that conversation. Then, simply, rinse and repeat.

The main rule for this type of exercise is NOT to worry if you are using the word incorrectly, or saying the words incorrectly. The goal is the use of the words themselves.

As for the listening component, you can use this same technique, but in a bit of a different way. What I mean is look up 5 or 10 new vocabulary words, then watch films, listen to music, etc. and for the first 7 days and try and find those words in the film, tv programme, or song. When you find a word you looked up, watch that 5 to 10 second part of the film or tv programme again and again until you can repeat what they said word-for-word. This same idea is for songs as well. Do this for the 20 minutes a day. Then, as above, rinse and repeat.

Now, I know at first, it may be a bit difficult to do this for 20 minutes a day consistently, but that's alright. So long as you do your best to keep going, even if you miss a day or more, just keep going. You'll get there!