Science

Hi,
With this subjects you can perform well in insurance sector, financial planning after MBA finance programme, you can appear for competition exam for bank, railway , CAT ,MAT GMAT , try for data analysis profile, teaching profile after your Master's degree level.
You can consider these options too:
Public policy
Development studies

In terms of industry requirement, B.Tech is much more ahead than B.Sc. (even done In CS/IT) and even followed by MCA. In entry level in IT domain they get better package, better position in job hierarchy with better career progression.

Yes, you can go for Masters after Zoology. You can opt for MBA as it is more inclined towards business perspective irrespective of the field. You can opt for MBA-HR or Marketing/Market Research. These subjects will only include basic maths.

Hi,
Maths can be assigned a lesser time than physics and chemistry as a major portion of maths is covered during the preparation of board. But, this subject must not be ignored. Here the trick is to practice more and more important topics. In the beginning, some questions may sound alien, but as you keep on practicing, you will start having a command on the subject.

Do 12th with science PCM + Computer Science. You can choose integrated program B.Tech+LLB. I think you can achieve both.

If MBA in mass communication is pursued from MICA Ahmedabad, then don't miss the opportunity.

Revise all lessons key points without looking any notes or text but by locking it deep in your mind. Don't forget to revise all important derivations, optical instruments, galvanometer, cyclotron, etc. and why should be thorough with all formula.