Aviation

Maths is compulsory to become a pilot. You need physics and maths with 50% marks in 12th to apply for CPL course. For more information please read this article:
https://www.shiksha.com/aviation/flying-pilot-training/articles/career-in-commercial-flying-all-you-need-to-know-blogId-13472

Airborne Academy has a great placement record.
http://www.airborneairhostessacademy.com/companies

Dear,
AVSEC course is not open for anyone, you need referral from any of the organization registered with BCAS. Civil aviation security is under BCAS not under DGCA. You need to get employment with any airline or airport to get nominated for such course.

It is around 37-40 Lacs.

No institute can guarantee you placements. Recruiters do come to the campus but it totally depends on the student's efforts and academics performance, which helps them to grab an offer.

You should start solving the question papers because time is the most important factor during this exam. Start solving the papers with equal time limits. At the end of the day, refer the topics that you are lagging in.

As the information is not available online, you should ask the institute directly:
http://iaa.edu.in/enaai/contact.php

No, I do not think they offer hostel facilities. You can cross verify by calling them directly:
https://www.frankfinn.com/contact/

Yes, it does. Please refer the link to know the details: https://col.thomascook.in/centreoflearning/