Diploma

Yes dear, you have to visit DTE counseling website. Check this pdf for details: https://goo.gl/DtmNYt.

No, there is no lateral entry in any legal COA approved architecture college. First, you have to take JEE/NATA and then you need to get yourself registered in the 1st year in order to receive the COA registration after completing the 5-year programme.

The following colleges can meet your requirements as under:
1. Feroze Gandhi Polytechnic, Raebareli Uttar Pradesh
2. Agnel Polytechnic Sector-9 A, Vashi, Navi Mumbai
3. Adesh Polytechnic College, Muktsar Punjab
4. Anjuman Polytechnic, Nagpur
5. Chhotu Ram Polytechnic, Rohtak, Haryana.

Hi Vivek, Please find the link below for Certificate in Entrepreneurship colleges and MBA in Entrepreneurship Colleges in India:
https://www.shiksha.com/business-management-studies/colleges/certificate-entrepreneurship-colleges-india
https://www.shiksha.com/mba/colleges/mba-in-entrepreneurship-colleges-india.

Hi Balaji,
The minimum eligibility is mostly 10+2 with good communication skills.
There are a lot of colleges providing the degree in this course.
Please click on the link below to check colleges offering aviation courses:
https://bit.ly/2OsMNyk

The eligibility for air hostess course:
Age- 17 to 24 years.
Minimum Qualification- 12th pass and above, having a pleasing personality and good communication skills.
Selection procedure- The selection will be on the basis of personal interviews.

Both are good. I think that for becoming a director, more than your qualification, your creativity matters. You should have a good sense of people's emotions, wants, and opinions. You should think out of the box.
As such, in my opinion, a certification course can give you many new opportunities.
Best of luck!