Chennai

Orient Flying School is one of those which I'm aware in South India. For becoming a commercial pilot, there is a specific eligibility criteria, which you should first be aware of. This is decided on what subjects have you taken in class 12th. It requires 50% in PCM to be a pilot. Your BE degree will be additional qualification although it won't be considered for your Training. Further, you should be aware that you are medically fit to be a pilot, so I would suggest you to visithttp://www.dgca.nic.in/medical/medical-ind.htmandgototheclass 2nd examiners tab to find out doctors who will examine you for initial fitness. You can visit any doctorate from the list as per your convenience. Once you are done with Class 2nd medical, find out a suitable flying club for you as per your convenience. You can fly in India or abroad. I would suggest you fly in India. Besides finding the club, be aware that you will have to appear for:
1. Air Navigation
2. Aviation Meteorology
3. Air Regulations
4. Aviation Technical
5. Aircraft Specific
6. Radio Telephony
Here, 1-5 are conducted by DGCA and 6 is conducted by WPC. Prepare for these subjects and appear, as exams are conducted every quarterly. For preparation, flying club will help you or there are private instructors available in metro cities as well. You will fly for 200Hrs + Clear DGCA and WPC exams + Clear Class 1st medical, then you shall GET your CPL. The next license is ATPL, which you shall be able to apply for once. You will then have to probably fund or self-sponsor your type rating on whatever fleet you are selected in an airline. Then, you finally get a job as a pilot. I hope the process is well explained to you. CPL is an expensive affair. It might cost you around Rs.18-20 Lacs for flying + DGCA exams Rs.500/- each exam + Medicals for Rs.10, 000 + endorsements and license issue fees around Rs.25k + Type Rating around Rs.15 Lacs. So, decide wisely before you enter the field. Some good flying schools in India in terms of training are as under :
1. IGRUA, Raebarelie Fursatganj
2. NFTI, Gondia
3. Chimes Aviation, Sagar
4. MPFC, Bhopal
5. BFC, Mumbai
6. Carver Aviation, Baramati
7. Falcon Aviation, Faizabad.

Check out the links for various colleges offering engineering lateral entry and check details for application:
https://www.shiksha.com/b-tech/course/b-tech-lateral-entry-hindustan-university-kelambakkam-Chennai-251382
https://www.shiksha.com/b-tech/course/b-e-lateral-entry-bhajarang-engineering-college-pallikaranai-Chennai-238035
https://www.shiksha.com/b-tech/course/b-e-lateral-entry-rajalakshmi-engineering-college-rec-thandalam-thandalam-Chennai-248135
https://www.shiksha.com/b-tech/course/b-e-in-electrical-and-electronics-engineering-lateral-entry-ssn-college-of-engineering-okkiyam-thuraipakkam-Chennai-237135
https://www.shiksha.com/b-tech/course/b-tech-lateral-entry-dr-m-g-r-educational-and-research-institute-university-mgr-university-maduravoyal-Chennai-236523
https://www.shiksha.com/b-tech/course/b-e-lateral-entry-tagore-engineering-college-vandalur-Chennai-238631