CBSE 12th

Check this link : https://www.shiksha.com/b-tech/gujcet-exam-question-papers.

Yes, you are eligible, but you need to give the entrance test for SRM University first.

Most reputed colleges ask for minimum of 50% and above for admission in UG courses. You need to decide on the college and check for their eligibility before applying.

The eligibility is candidate must have passed 10+2, or it's equivalent with special aptitude in drama. There is no entrance test for admission.

Hi,
Admission in good colleges depends on your marks and grades. You should know what you want to pursue and the subjects required for it. For example, B.Com honors requires Mathematics, and if you don't have it, you can't pursue it. So, make wise choices and work hard.

Yes, you can surely get admission for BBA, as Science students can join BBA as other stream students can.

Yes, you can get good marks in NEET, if you prepare properly. And even class 12th marks are also considered at the time of admission, not class 11th marks.

Then I think that the best option for you to understand what are you made to do, first complete your 12 from artside then think about Diploma. you can go for BSC, BCA, law, hotel management, fashion designing.there are many options out there you only have to choose best course for you.

Yes, you can pursue Economics honors without maths.

Hi Jhanvi,
As far as I know, I don't think any college will allow changing the course after first year.