Science

Nowadays everyone is educated and there is a huge competition in jobs, the jobs are less and you need to learn some good course like Java, Oracle to be unique than others or else being Android developer is the best.

Physics by Fiziks
Career Endeavour
UGC Point
Aryan Classes
Above listed are some of the best coaching centers for M.Sc (Physics) in Delhi.

EdX is an open online course providing website that provides the reputed courses from various Universities and colleges by charging a minimal amount of money. Some of the courses are even free of cost. They certify you the course after its completion as well.
Yes, it boosts the chances of getting admission in USA's top universities.

No, you won't be having these subjects in 2nd year of MBA with specialization in marketing.

Hi,
Admission in 2nd year B.Tech after completing B.Sc is not allowed anywhere in India. So I don't think you can do so but you can pursue MCA from DTU by cracking the entrance. It has almost same value.

After completing B.Sc in CBZ, you can go for M.Sc in any of these subjects. You can also go for B.Ed which will make you eligible for teaching in high schools. Once your PG is done you can prepare for NET for lectureship. You can also think of some fields like biotech, plant anatomy and physiology, neurobiology. You can try for government jobs as well.