Hello there. Hope you are doing good. It is good to know that you have interest in programming along with maths which opens up good career options for your in future. I would suggest you to opt for engineering if you find programming interesting. B.Tech CSE could be an ideal option for you since it prepares a student to become a software developer, software tester, data analyst in future. You can also go for BCA i.e Bachelors of Computer Applications which prepares a student to become a web developer, mobile applications developer, technical support executive but considering the level of maths and programming involved, B.Tech is a much more advanced field of study in comparison to BCA. So, my suggestion for your is to go for B.Tech considering your interest of subjects.

Hello there!
Since you have mentioned your interest in computer programming and stuff you can pursue BTech in (CS and IT) after 12th.
Other options are Bsc in computer science/mathematics/mathematical sciences , BCA though Btech is given priority among these all.
You will have to appear for entrance exams like jee mains after 12th to get admission into a good college like IITs.
Hope this helps!
All the best :)