Study Abroad

No, because you need to complete 12th for that which you have not pursued in your education.

No. You need to complete your 10+2 first. Then look out for eligibility criteria in the institutes that you are eyeing and the visa requirements to study abroad.

A good first class, anything above 70% will brighten your prospects to get into a good college or university.

Difficult to pin point university names, too many backlogs will make admission difficult, get help from an overseas consultant like Shiksha or IDP, etc., your profile will be studied carefully and universities will br shortlisted accordingly. James Cook, Griffith, La Trobe etc., check these.

Complete your 12th preferably with a first class and clear SAT or ACT to be considered eligible for undergraduate programs in US. Keep in mind that admission requirements differ, different universities have different cut offs and build your overall profile such as extracurricular activities. Take the TOEFL for English language proficiency. Research university requirements visit their websites and shortlist universities basis requirements, your profile, budget, etc. Prepare a year ahead of the admission intake.

Yes, you definitely can. You only need to have a Bachelor degree. It can be any. Of course they prefer prerequisite knowledge in a few areas. You will find details in the below link:
https://www.mbastudies.com/Master-of-Business-Administration-in-Aviation/Singapore/SAA/
Check out this link. It has all the details.
All the best.

Well, that depends on the University that you are looking for there. Each University will have different eligibility criteria. So what you have to do is check out different universities and find out which University offers the eligibility criteria according to your marks. As for the IELTS any one can apply for IELTS. You graduation marks don't play a role there. All the best.