B.Com

Dear Sarthak,
Since you have scored very good marks in 12th my recommendation is you should apply for admissions in DU considering your marks you will be eligible for admission in north campus colleges, so quite simple first pursue regular college there. And on the completion you will have option of campus placement in good corporates or if you wish to study further then you can go for professional courses or MBA from a reputed college.
good luck

Hi Shubham
You have already won half battle since you know your weakness. Maths needs practice so if you find it a challenge, practice more as its required in all courses. Since CS is a professional course, you can go for b.com simultaneously as it will help you in further growth in education. For CS, you may look at the following link.
https://www.icsi.edu/WebModules/AboutUs/Courses/CS_Course.htm

M.com or MBA.These are the best option to pursue after b.com.If your family belongs to middle class, then pursue from govt. institutions.

then go for its good University

It's depend upon your location and your choice

Dear Chetna,
Any course from a Reputed college of Delhi University is valuable , Talking about B.com pass , few Du colleges even provide campus placements to it's students. Now its upto your 12th score that which college you get.
good luck

Dear Aspirant,
Both the course have their identity and demand you may choose according to your interest. In both field have different types of jobs and demands are in market. For instance you go for B.SC you can do B. Ed after and can find teaching job but if you want some challanging jobs you may go for B. Com also, it's totally up to you.