B.Sc

It is one of the best option to choose from. Like statistics is the most growing field these days. Every working company requires statisticians, and this combination will provide you with many job opportunities, just after three years. Or, you can also go in research sector depending upon your interest. Other courses you can do are:
M.Sc statistics or maths
MBA
Actuarial sciences.

Yes, you are eligible for M.Sc Statistics, but you need to clear an entrance which has 60% statistics and 40% Maths. Prepare for it.

It totally depends on your interest, but if you are looking for job opportunities after graduation, go for B.Sc Statistics.

Yes, you will get admission easily. Just wait for the process day.

CBSE class 11th and 12th Maths should be on your tips for B.Sc maths entrance 2018.

Unfortunately, yes. For any marine courses, you need to have maths.

Yes, you are eligible.

There is no comparison between agriculture and genetics. Each branch has its own merit and demerits. So it comes down to personal preference. If you think Genetics offers promising career than choose Genetics or vice versa. However, in terms of opportunities, B.Sc in agriculture has a lot of career options and also you can pursue higher education or do a business in agriculture.

B.Sc Electronics are having lots of scope nowadays. You can easily get a job by doing Electronics and you can start your own business. B.Tech ECE is also having the scope but electronics have great future.
Best of luck for your future.