Class 11

I would let you know that if you have cleared the overall cut-off then it is not compulsory to clear a particular subject's cut-off.

Dear Siraj,
These are some mandatory subjects which you require for getting admission in AME in your 12th class.
Class 12th:
Mandatory Subjects: Physics, Chemistry, Mathematics
Regards.

Absolutely Yes. 11 standard maths for commerce is same as the PCM in CBSE. As they have same question paper in 11 class annual and mid-term examination and same to same course and number of chapters. And this criteria also continue in 12 standard too.

No. Suggest your friend to complete his 12th first. After that, he could take admission in B.Tech CSE.

No fixed percentage are required. You can Maths with any of percentage. But, if you go in engineering field, you need at least 55% marks, but these would not be enough to sit in an interview for some of best company. So, do score at least 60% marks in class 10th and class 12th as well. All the best.

It completely depend upon your understanding. In class 11th, the syllabus of physics is full of mechanics, there you need to know the basic concepts of mathematics that is integration differentiation and all. Similar is with class 12th also.

Hi,
It is possible after 10th but it is not the most convenient or popular choice. Even foreign universities ask for a minimum of 12 years education, so better you complete 12th in India. 11th and 12th or high school abroad is also very expensive for foreigners. For the locals, some schools are free. It is better you stick to 11th and 12th in India, study hard and try to achieve a first class and thereafter, apply for a Bachelors degree abroad.

Hi,
If you opt maths in 11th class you have to study following topics like: sets and function, relation and function, trigonometric function, algebra, complex number and quadratic equation, permutations and combinations, binomial theorem, etc.

Yes, surely, it will help you.

Yes, surely you can get admission with your duplicate TC and it's completely valid.