There are so many language schools today locally and internationally, so it can be a difficult task
deciding which one is credible not! I think that language schools benefit mainly those who are
complete beginners. For fluent speakers, I think language schools are not necessary.
The best way to learn a new language, in my opinion, is to have 1-2-1 or group language exchanges(check out my blog https://www.speaksofidence.com/post/how-to-start-an-english-speaking-club-with-friends )
Many choose language exchanges that are free of charge so you have nothing by taking part while meeting new people informally without the pressure of exams and so forth.
I have found that meeting people face to face to practice speaking Spanish has increased my confidence and speaking Spanish immensely.
Advantages of language schools
Feedback on progress
1-2-1 or group classes
Recognized accredited English qualifications
Qualified and verified English teachers with experience
Disadvantages of language schools
Too many competitors
Takes to long to learn
Only formal English language taught not enough emphasis on general English