English television and games. That's how I learned English.
When I was twelve, my English was better than most of my classmates who are now 17.


I would recommend English subtitles while watching French Channels/movies etc. Doing so you link the French with the English words.

You could also start watching French news. Their pronunciation is top notch and easy to follow. If you encounter difficult words of which you do not know the meaning, write them down and look them up afterwards.
I'm doing the same thing with German.