What are the most authoritative etiquette training institutions in the country?

Chongqing Yasi Etiquette Co., Ltd. focuses on corporate etiquette training, business etiquette training, social etiquette training, service etiquette training, hotel etiquette training, bank etiquette training, insurance and securities industry etiquette training, government etiquette training, and medical care Etiquette training, real estate etiquette training, teacher etiquette training, student etiquette training and other fashionable etiquette training. Chongqing Yasi Etiquette Co., Ltd. is the Chongqing Assessment Center for IPA International Registered Etiquette Trainer Certification. Its address is D4, 20th Floor, Lihai Building, Nankai Pedestrian Street, Shapingba District, Chongqing