The way I helped myself to remember all the vocabulary or anything I had learnt in general was simply to immerse myself in Spanish or be able to apply it. Luckily, I have a couple of friends who speak Spanish so I talk to them in Spanish sometimes and they are able to correct my mistakes. You should also try watching Spanish movies or TV shows and pick out the words you know. The hardest thing I found when learning Spanish was remembering the masculine and feminine. The best way to remember is simply to revise them or apply them in conversation, and if you are wrong hopefully people can correct your mistakes. This helped me and I hope it helps you too!