Hey 

 You must always choose your career path keeping in mind your interest and you passion as it will help you grow in the longer run and would also make you shine out of your box. Engineering also as a career path is a good choice to make as it offers you decent packages and a respectful life in future .  However apart from engineering you have other fields as well like management and even CA coz you have interest in maths . You think and explore and then make a choice

You should always choose the course according to your interest.

Yes, Engineering has good scope in the future in terms of jobs and placements.

If you have P/C/B/M subjects then you can go for below courses

1- Bachelor of Architecture (B. Arch.)
The Bachelor of Architecture (B.Arch.), recognized by Council of Architecture (COA), is 5-year degree programme including a period of practical training prior to professional examination and registration.

2-Bachelor of Computer Applications (BCA)
Bachelor of Computer Applications is an undergraduate degree course of three years which equips candidate with skills to analyze & synthesize computer systems, applications & information systems.

3-Bachelor of Planning
Bachelor of planning is a professional four-year technical degree programme which prepares candidates with adequate skills for infrastructure planning in different capacities.

4-Bachelor of Science
Bachelor of Science is three-year degree programme offered in multitude of specializations under the pure sciences domain such as Maths, Physics, Chemistry, Botany, Zoology etc

Good Luck!!