It doesn't really matter which English learning center you attend. It depends entirely on you. It is not EF has helped you to improve your English. The person who can claim credit for your improvement is actually yourself. Because you have spent more time learning a language. EF is like a gym, some people go to gym 3 times a week, rain or shine, and some others only go to the gym once a month, so you can imagine the huge differences in the final results.

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because  you never pushed yourself as hard as you are now... and if you really want to improve your english, then take a leave from your work, and go to america, australia or england, stay there for a year, i bet your english will have a giant leap forward. and you actually spend less than go to ef. and btw, the secret in learning english is the ENGLISH SPEAKING ENVIRONMENT.

good luck to you.