B.Com

The last year minimum CAT cutoff percentile for top 3 Iims are given below in asked category for an idea.
1. IIM Bangalore :
a) Sectional cutoff : 65
b) Overall cutoff : 70
2. IIM Kolkata :
c) Sectional cutoff : 65
d) Overall cutoff : 70
3. IIM Ahmedabad :
e) Sectional cutoff : 60
f) Overall cutoff : 7

Yes, you might get a seat in 2nd or 3rd Counselling, so please take another college in your Backup options like DAV10, PGGC11, PGGC46, MCM DAV.
ALL THE BEST

See without Maths it is very difficult in GGDSD College, also NSS carry only 1% weightage in the overall percentag, So i think you should try for PGGC11, PGGC 46
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GGDSD College is not possible with this percentage, you can try for PGGC11, PGGC46
ALL THE BEST.

Without maths it is quite difficult in GGDSD but you can try for PGGC11, PGGC46. But still fill the form for GGDSD College too may be you get a seat in 3rd or 4th counselling.
ALL THE BEST & FEEL FREE TO ASK ANYTHING

See as you are a NON UT, B.Com is not possible with this percentage, but you can try for BBA in GGDSD College definitely that is possible with this percentage.

No, you need to have studied and passed maths in class XII. You don't need to include it in best 4 , but you need to have it as one of the subjects in class XII.

Just fill the UG application form which is available on the DU website. Once SRCC releases its cutoff you admissions procedure, you'll know what to do. Just stay updated and keep checking the DU and SRCC websites regularly.

It will be released on the DU and SRCC websites once the applications are closed.

No, it's not necessary to include maths in best 4 ,you just need to have studied and passed in maths in XII.