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My personal suggestion would be NONE. If you think that you are a cabin crew material, please apply for all the available vacancies with the airlines. If you get selected, they train you in any case. Airlines do not trust on the training acquired from institutions. The only help you get from the institution is that of the interview dates.
In the interview, no airline will ask you any questions about Safety, First Aid or Services coz they are airline specific when it comes to service. But yes, if you are an experienced crew, be ready to answer a few technical ones. In your case they judge you on your personality, grooming, communication and BMI.
To talk about the training, Jet Airways provides one of the best training and that lasts for about 3 months.
Therefore, scrap the idea of joining a private institution to be trained on cabin crew attributes and don't waste your money.

It's good. FOSTIIMA has the largest group of IIM Ahmedabad graduates working together towards a common goal. Not only is it created and managed by IIMA alumni, its large faculty pool is also drawn from IIM/ IIT alumni. They bring with them their vast corporate experiences, industry practices and global business perspective to FOSTIIMA students. The faculty have been top honchos in various industries and have 30-40 years of experience. These IIT / IIM educated faculty take great pain in mentoring students with the sole objective of grooming them to their peak potential, so that they can make a positive contribution to the society, business and industry.