Science

You can get into IT sector.
All the best

Hi,
Following are the courses for science stream students:
Courses for Mathematics group students (P, C, M Subjects):
1 Engineering courses
2 B.Sc. Courses
3 B.C.A.
4 B.Arch.
5 B.Pharmacy.
6 B.B.A.
7 Commercial Pilot training
8 Diploma Course in Fire Safety and Technology
9 Merchant Navy related courses
10 Join Armed Forces
11 Diploma courses
12 Other good courses
13 Some Design related courses
14 Bachelor of planning
15 Bachelor of Interior design
16 Teaching & Education courses
17 Pharm D
18 Management Courses
19 Degree Courses from other streams

Apart from a decent +2 score (75 %+), you need to sit for IELTS in case you are looking for high ranked universities in the UK. SAT exams are not required for the UK. It's mostly IELTS exam that you need to clear with overall 6.0 bands in most cases. Let me know which program you wish to apply to so that I can suggest a few universities.

Of course, you can. But, make sure you are able to keep up with the cutoffs. If you are not able to get your desired course in a desired college, I'll suggest you to choose course over college. If the cutoff is not favorable, you could go for options like SOL or IGNOU. One more thing, there are other great colleges than DU. Kindly, keep a track of all the admission forms from the month of March.

There is good scope after B.Sc. IT because it is IT field. Also, you can pursue higher studies after B.Sc. in IT, e.g. MCA, M.Sc. IT, etc. You may get job in IT sector after the completion of your B.Sc.
You have career options in this field as web designer, junior software developer, database admin, backend developer, graphic designer and many more.

You can do B.Com or B.Com (Honors) even after PCM at class 12th. There is no special courses required to fill knowledge gaps except you do self-learning of commerce and accountancy subjects during your summer breaks and your personal time.