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Personally,
I do not prefer any English speaking classes and do not believe in their so called claims.
You can follow these points to improve your English over the period of time.
1) Read good Novels: Reading is the key here, if you want to speak good English then first learn to read. Start with some interesting novels.
2) Improve your vocabulary: Whenever you come across an unknown word, mark the same and try to understand its meaning in the context. Use a dictionary and later try to use that word in your write up.
3) Practice in front of mirror: If you want to improve your public speaking then mirror is your best friend. Try to explain your thoughts to yourself first and then once your convinced convey the same in front of a group of people.

PU has better infrastructure, proper labs, tops in regularity in classes, separate placement cell which is continuously working 12 months of the session to enhance the confidence of the students/improving technical skills as well as grooming and communication skills. Faculty members are highly qualified. Poornima University has been awarded as the best upcoming university of India by ASSOCHAM, New Delhi. Poornima University has been awarded as the Top Private University of Rajasthan-2018. It has achieved the highest placement in Rajasthan. Also the various branches under B.Tech with well experienced faculty and the innovative way of teaching makes Poornima University best to pursue B.Tech.

Hello Raman,
The following are some the colleges for B.Sc hospitality In Delhi:
1) Cradle of Management Institute
2) Banarsidas Chandiwala Institute of Hotel Management and Catering Technology
3) Dr MPS Group College of Hotel Management: Best Hotel Management College and Institute in Delhi
4)Delhi Institute of Hotel Management and Catering Technology
5)ABHI Institute of Hotel Management
6)Institute of Hotel Management, Catering and Nutrition
7)RIG Institute of Hospitality and Management
8)The Hotel School
9)Triambke Institute of Hotel Management
10)The Oberoi Centre of Learning and Development (OCLD)
11)Tedco Education
12)Institute of Hotel Management
13)Hope Institute of Hospitality Management
14)Jagannath Institute of Management Sciences
15)Skylark Institute of Travel
16)UEI global
You may also refer the link below:
https://www.shiksha.com/hospitality-travel/hotel-hospitality-management/colleges/b-sc-colleges-delhi