Humanities & Social Sciences

Yes you can learn. Try out some free online courses on:
https://www.edx.org/

Yes, you can. Subject is not a constraint. In my view, you should opt for political science and geography. These two subjects are easy to qualify.

For IAS preparation subjects like history, public administration, economics, constitution & geography are quite good. I've heard UPES Dehradun has come up with a special IAS oriented BA program for IAS aspirants. Its BA in public policy & administration along with IAS coaching & test preparation. The university has joined hand with an IAS preparation academy for this. Its very unique course but I think could be very effective for your IAS preparations. If you want to get more details you can visit the official website

Yes you can as the qualification for being an air hostess is 12th pass with 50% marks, good height, fluent in English.
You can join any air hostess academy after 12th for your Diploma and apply for any airlines.
All the best.

You should better ask your HR department and your manager where you work. They can better guide you for internal job posting and vacancy.

You are eligible to join defense services after 12th class. You are advised to appear for NDA examination conducted by UPSC twice a years for Commission in Defense Services.

You have good academic performance and right subjects in graduation to score well in Civil Services examination. You are advised to prepare a Civil Services examination preparation plan based on your strength and weakness analysis. You may seek advice of your teachers for an independent assessment about your ability to crack exam. If there are lots of gaps then you may seek external coaching support. If you are focused to achieve your targets, you can definitely crack Civil Services Examination.