why I work hardly in my French course and i have the same Fluency (54%) several months ago?
On the French for English speakers course it is very difficult to get more fluency than that. The Duolingo fluency scores are very unusual and you shouldn't worry about them too much.
It is hard to get more than that with the French course, as far as I know, while it is possible to get more than 70% in English from French. Just disregard this ridiculous fluency percentage.
It's time to expand beyond Duolingo if you haven't already. To progress, it's important to start learning new material rather than continue doing the same exercises. Good luck to you.
Other ways you could improve your French:
The reverse tree, the course English for French speakers, is very useful. There you have to translate much more from English to French.
Here is the link to the Duolingo Help Center for
"How do I switch my Duolingo course language?"
Use the web version of Duolingo (http://www.duolingo.com) instead of the App. The web version works also in the browser of a tablet or phone.
Try to read and write in Duolingo's French discussion forums. There you will find the daily used words, sentences and idiom.
Apart from that
- read a newspaper article every day and try to learn its new words
- listen to podcasts, watch movies with or without subtitles
- converse with a native speaker as much as possible
- write smaller texts, upload them on lang-8.com and let them be corrected by native speakers a.s.o.
There are numerous possibilities. Duolingo will only bring you to an A2/(B1) skill level in reading/writing and A1 (maybe A2) in listening/talking.
Info about language levels:
Read from "Common reference levels".