B.Sc

Delhi University is one of the best options for maths honours.
Also, you can look into:
Christ-Bangalore
St. Xavier's, Mumbai
Loyola-Chennai.

GB Pant University conducts it's own entrance exam every year. You can apply online for it and then keep looking for all the notifications like admit card and date of exam. A merit list will be prepared and according to which admissions are granted. It is the best agriculture university in India , so you have to work hard in order to get admission there.

You can pursue the desired subject, there's no requirement of maths in it. According to the eligibility criteria, one should have science either maths, biology, or agriculture in intermediate. HSC.

B.Sc Computer Science is not equivalent to B.Tech because, in B.Tech, you study more subjects than B.Sc. But you can still get a job on what you have studied.

Hello dear,
I am sharing you the link which will give you all basic idea of the exams from the eligibility, syllabus, exam date and other sorts of information. This will help you to clear all the doubts regarding your upcoming exams:
https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/university/national-institute-of-technology-durgapur/exams/amp/nimcet&ved=2ahUKEwi0wqPZ-qPbAhXMeisKHWNIBA4QFjABegQIBxAB&usg=AOvVaw0GFjLYbVUhmpEMJbG-FsR_&cf=1
All the best.

Kirodimal college is best college for you doing bsc maths as it offers a very good teaching and have a bunch of very hood teachers who can help you out at every point so go for counseling if you get admission in it take it with both hands and you go takes places in your life.

It depends on what you want to do. B.Tech is more job/industry-oriented (although research field is also popular nowadays). Whereas, B.Sc is more of research-oriented.

It would be very hard and troublesome for you, if your sketching is not good. Also, you should have good knowledge about programming and computer software. Professional Studies in gaming usually requires students to be very good in graphics design. If you can learn Photoshop and drawing along with course then you can go for it.