Distance/Correspondence

Yes, you can still try for air hostess job. All you need to do is appear for the interview.

Yes, it can be possible considering that you can come down to appear for the exams.

Consider Diploma in mechanical or automobile offering from your state Diploma board in ccc (correspondence cum contact) mode.
SBTET- Andhra Pradesh offers the same. (consider it, when you come India permanently)

M.Sc. in Cyber Forensics and Information Security from the University of Madras is a regular full time course of 2-years duration.
For further details, refer to the link provided below. Details like course fees, eligibility, admissions, etc. are mentioned at the link provided below.
https://www.shiksha.com/it-software/course/m-sc-in-cyber-forensics-and-information-security-institute-of-distance-education-university-of-madras-chepauk-chennai-289662

Hello, Sudhir, Distance Education is same as correspondence course. But beware, recently SC has cancelled all degrees awarded to engineering degrees awarded by means of distance education. Its better not to go for it.