History

It would not be a great idea to change the subject now, as it will impact your studies and also will impact your future opportunities.

Hi, you can definitely take admission for BCA regardless of subjects you have taken in your +2, but I think some institutions mandate maths in +2.

According to me, you have to pursue BA in history. Unless it is not possible to do MA in history. No university will give you such chance.

Yes, you can pursue BCA. The eligibility criteria is different for every university. So, you'll have to look for those universities which can provide you admission into BCA. Generally, minimum percentage required for admission is 45%, if you can satisfy this requirement then you can get admission. If you want to learn programming languages which you will be studying in your BCA course then you can check out this app which is specially designed and developed for BCA students. It has programs and assignments of languages like C, C+ and Java with their outputs. You'll be studying these languages in your 3 years of BCA.

You will need to contact the college website for the information. Also, you can do internet research for the same. I am sure this will help you.

After Ph.D, you can get a job of a lecturer. So, prepare for group exams. It is an optional choice.

Hi,
The college authorities can only help you with this information, as it is up to the college's policies and provisions. Kindly contact them directly for the information.

In order to score more marks, everything must be covered. If you think that it is okay with a few marks. You can just study the main topics in each chapter and skip some which aren't that important.