Do you regularly meet up with a partner to practice a new language you're learning? We're not sure what you call those meetings, but we like referring to them as "language exchange sessions" and it's one of the best ways to accelerate your acquisition.
Language is a social skill.
The amount of words you memorize or the depth of grammar you study with your language learning program won't matter if you can't use it in a social setting.
An exchange session gets you that social experience that allows you to use a language in an actual interaction.
Here are some ideas to make your language exchange sessions more productive:

1. Be prepared.
   Just as you prepare for class to gain the most out of it, you need to take initiative and come to your exchange sessions duly prepared.
   That means taking the time out before the session to plan specific situations and types of interactions that you want to practice.
   This helps the meeting stay structured and avoid devolving into a casual situation of two friends hanging out.
   
2. Pick a conducive meeting place.
   Make sure to choose a place that you're both comfortable with, where you can practice the language uninterrupted.
   A park bench on a lazy afternoon might be good, while the bar at a noisy club probably won't.
   
3. Use a timer.
   Establish time frames at the start of the exchange, such as you'll practice one situation for 15 minutes then move on to the next.
   While you can wing it, this helps you keep track of actual progress.
   Use a timer to signal when time's up and you'll know exactly when you're veering from the plan.
   
4. Focus on interaction.
   Language exchange sessions are best used for their intended purpose: practicing actual communication in the target language.
   Focus on that and try leaving other issues about the language towards the end.