CBSE 12th

Hi,
Qualification: 12th
Eligibility: 50%
12th mandatory subjects: Physics, Chemistry, Mathematics/Biology
SC/ST candidates must have secured passing marks only. Final year appearing candidate can also apply on provisional basis.
Admission Process:
Admission is through counseling based on the rank obtained in Banaras Hindu University Undergraduate Entrance Test (BHU-UET). For more detailed information you can see the below mentioned link:
https://www.shiksha.com/science/course/amp/b-sc-hons-in-agriculture-banaras-hindu-university-Varanasi-114907
Yes, you can apply for this course.

You can only go for M.Com after completing your graduation. You cannot skip these 3 years of graduation. B.Com is very preferable before M.Com.

Hello,yes you are definitely eligible for the graduate marine engineer course.
You will also have to pass through the medical and psychometric test.

No, you need atleast 65% in board exams to apply under SDS category. However, you can apply for visa in general stream.

I think you cannot get admission in current session. For admission, the current session result will considered and as per rules candidate must have passed 12th with PCM with 50% of aggregate marks and 50% aggregate overall marks. However, you can apply for next NATA, scheduled to be held in July-2019.

Hello Abhishek,
Aircraft maintenance engineering course is actually not an engineering course but a student gets B.Sc degree after successfully completing the course and the examination. Yes, you can get admission in this course after passing your 12th and there are no entrance examinations for this course. So select your probable institution and apply for the admission. A student after getting employment gets a salary of about 6-8 lacs per annum as CTC.
Best wishes to you.

http://www.ihmctan.edu/programs.html
IHMs are the leading places that everyone craves for and prepares well. It is not impossible but the focus on the basic things that they ask is must for anyone.
NCHMCT-JEE is the criteria that they ask for. You score shall matter a lot in addition to the 77.4 that you are mentioning.
http://nchm.nic.in/ has the details to make you apply. I fear that the last date was in March.
17th March to 3rd April I guess. Please check the NCHM website.

India Today Media Institute offers only Post Grad. Programmes as on date.

Yes, after completing 12th class studies, you can take admission in BBA. There are too many career options available for 12th science (biology) students. You can check some of the most popular career options here: http://articles.abilogic.com/196120/topmost-career-options-12th-science.html
I hope it will help you to choose the right direction for your career. For colleges go through this link:
https://www.shiksha.com/bba/colleges/bba-colleges-delhi-ncr

Don't go with Manipal University. It would be better if you go with Amity Distance Learning University. Read the article about Manipal University and Amity University:
https://topdistancemba.com/amity-distance-mba-admission-courses/
https://topdistancemba.com/2017/12/22/sikkim-manipal-university-mba/