Aviation

Yes, after Diploma it is available.

Strong communication skills particularly in English is the minimum mandatory requirement for the job of cabin crew and its training.

Dear Abil,
It depends upon institutes, check whether the companies are coming to placements. If yes, no problem, you can work on it and crack the interviews.
All the best.

If you are interested in civil aviation, you should be from science background in class 11th and 12th (PCM). After completing class 12th, you can register with a flying club, recognized by the DGCA. In order to practice as a pilot, you need to obtain a series of licenses such as SPL, PPL, CPL and ALTPL, which are based on the number of hours of flying training you progressively gain and by passing exams at each stage.

Can you specify the college?

Hi,
Pilot or aviation course can be done after completing class 12th or even after you complete your B.Tech in mechanical.
For more information, you can check the below mentioned link:
https://www.shiksha.com/aviation/flying-pilot-training/articles/career-in-commercial-flying-all-you-need-to-know-blogId-13472

If you want to opt engineering as a career option, you first need to have strong fundamental knowledge on physics, chemistry and mathematics. In this 4 year course, you have to do lot of assignments and projects and seminars and presentations. And maintaining your CGPA is also important to get a good job. Besides this, engineering life is quite enjoyable also. So, I advice you to go for it.

Check out this answer on Shiksha:
https://ask.shiksha.com/how-can-i-become-a-pilot-which-course-should-i-pursue-after-completing-class-10th-qna-4041599?referenceEntityId=4041615

Both courses are best in their segment.
It is upto you now, in which industry/ area you want to become specialised. Please visit the institutes for more information.