Class 12-arts

Yes, you can take admission in IGNOU for BA. You need to have passed 10+2 from a recognized university. https://www.shiksha.com/humanities-social-sciences/course/bachelor-of-arts-b-a-indira-gandhi-national-open-university-saket-delhi-8152.

The dates are not out yet. However, in 2018 it was conducted in the month of May.

You can do certificate course in security management from ICSS Delhi. Below is the link of it:
https://www.icssindia.org/Certificate-in-security-management.html
Another links are: http://www.ossim.in/Online-course.html
http://www.vobium.com/in/s/courses/business-professional/security-management.html

It's 2018, girls can pursue any course they want, no one can stop you. It's all about your interest and talent nowadays, pursue that course which interests you and you can make a good life after completion of that course. It all depends on your skill and not on your gender.

Study at least 5 hours regularly without missing. If you are flexible with this system you will be able to complete the syllabus on time. Don't be confused looking for strategies. Keep clearing your concepts. Study every subject regularly for at least 1 to half an hour. Give yourself deadlines and keep going. Have break time between studies also. So that, your mind is fresh. All the best.

That is an interesting choice. I assume, you have computers and/or Maths in your subject choice in class 12th. You haven't given your marks, not have you mentioned if you are interested in degree or Diploma. Computers usually has a higher cut off than other courses but there is a variation between 50% (pathway Diploma) to 95% (for top universities). It depends on your marks and your budget. Big universities like Toronto, Waterloo, Alberta have higher cut off. Smaller universities like Memorial, Winnipeg have lower cut off. Colleges mentioned by previous user offer good applied degrees and Diplomas.

If you are interested, you may pursue a career in Arts itself. Performing arts, Fashion Technology, Fine arts etc. Are some of the fields you can try. Animation is another field. If you prefer teaching, UG and PG in History/ Political Science will help you with an MPhil/PhD.

Yes, you can repeat and again have to clear 12th class. And it requires a whole year for completion. I suggest, you have to move with what you have. All the best.

No, you cannot do B.Sc.

Hi Ritika Pathania, Kindly refer to the answered question on a cosmetology, clicking the link below:
https://ask.shiksha.com/what-should-i-do-to-become-a-cosmetologist-qna-3977262.