Science

Maths is mandatory for Engineering and Science graduation. Maths is not difficult. In case you are not able to cope with it, you are advised to seek professional coach/ teacher help to improve your Maths fundamentals.

Definitely you can do Masters degree after completion of your Bachelor's degree. :)

Yes you can do! Amity University gives B.Tech even if you have PCB I myself got selected there! don't worry about it. . go try your luck!

It is all based on Your interest, research , know about both the branches {full detail} before coming to a conclusion .

I dont know about BCA but for B.Tech u need maths in 1st and 2nd semester and for further semesters(ie.3,4,5,6,7,8 th) it depends on the engineering u are pursuing .

Same Scope! seriously I am not joking. . after all B.Sc's you can go for teaching lecturer Govt. exams or some other field of interest!

Prospective applicants desirous of taking admission to First year of undergraduate course in Architecture (Bachelor of Architecture) in India take NATA. NATA scores are used by admissions authorities of different Government, Govt. Aided & unaided schools / colleges of Architecture, to provide common measure for comparing the qualifications of applicants, for admission in addition to their scholastic performance in 10+2 or equivalent examination.
here is a link for all approved architecture colleges across India - https://www.coa.gov.in/index1.php?lang=1&level=0&linkid=25&lid=26