Class 11

Hello Ekata,
This path normally is not followed and hence only sketchy information is available. However it is not impossible. Again medium of instruction is mother tounge and hence it's best if your ward goes to english speaking country.

I've heard Ferguson is good but from this year on they've been really strict about attendance. So, if you are planning to go for classes I wouldn't advise Fc. Sir Parshuram Bhau College (SP College) is also a good college.

In case you are planning to do software engineering (B.Tech CSE/ IT/ Software Engineering) then in addition to maths you are advised to take physics and chemistry also. If you want to do BCA then maths is the only mandatory subject.

Hello,
Since there are many projects which will get good project topic:
http://mindandbrainpower.blogspot.in/2012/09/project-topics-and-materials-in_727.html

Vast difference, Maharashtra board's syllabus is merely an introduction of the topic, no background history, no further application whereas CBSE board uses a step by step approach for any topic.
You will see that all the government exams have their syllabus based on NCERT books (i.e. CBSE books), that is because it gives right amount of knowledge to the child at the right time.
More importantly, the language usage of CBSE books is far easier to decipher as compared to that of Maharashtra State Board.

Yes, you can study both maths and biology by selecting AB group in class 11th (science).

It is not possible to pursue any engineering degree while studying in classes 11 and 12. You need to complete 12th class with a good score to do engineering.
To pursue genetic engineering you should take PCB and you are advised to write some entrance exams like JEE Mains, VIT , SRM, etc. in order to get a good college for biotechnology and genetic engineering.

CBSE is a better option after 10th board in comparison to state boards because it's syllabus is aligned with majority of medical and engineering entrance examinations.

The scope is huge. But you should be able to cope up with the study burden and you will be questioned about it in every job interview so you should be able to justify your choice.