Take a French immersion class in France. These classes can be taught from anywhere from one to eight weeks according to CoeurdeFrance.com. Placement tests are available to see where your current French language level is. These classes teach French while using French. The classes are not in English as there may be students who do not speak English.
Read popular English books in French. Most popular English books are translated into other languages. Read a popular book that has been translated into French such as "Harry Potter" or books written by Charles Dickens. Reading the English version first will help you understand the French version better as you already understand the plot.
Find a French pen pal. Meet a foreign exchange student or find a French speaker online and communicate with him through email or video chat. You can offer to practice English with him in exchange for help with French.
Go to a French area where English is not spoken. Speaking with someone who knows English already allows you too much leniency. You learn much faster when English is no longer an option with which to communicate.