I study before bed as it's been proven that sleeping on what you have learned improves your ability to remember. I also use the site memorize for vocabulary. It uses a timer so you need to answer within the time limit. It helps drum words into your memory. I also use games and puzzles like crosswords that have the clues in one language that you need to answer in the other language. If I don't know some words I come back to it a month or so later and it's surprising how much I've learnt and encourages me that I am progressing.