Biology

Dear Anurag,
According to your statement, I would suggest you to firstly concentrate on your study. You can enjoy Bachelors life in every programme but that depends how you maintain your time table for fun and study.
Once you have knowledge and experience, you can earn well whether you are in medical, engineering, teaching or corporate job and enjoy your life too.
Pick the field according to your interest and caliber and give your 200% for that and than see the result.
All the best.

In improvement exam only those subject marks get changed, which you are going to write again, other remain the same.

Pituitary is the master gland of our body. It is an endocrine gland secreting a number of hormones that regulate many bodily processes including growth, reproduction and other metabolic activities. It is very small in size, grey colour and weighs is just 0.6g.

You may become a professor of biology if you scored well. You may also get selection for Universities so that you teach the higher level students. Pharmacy is another option for you.
All the best.

You aim at two and it is good. In that case, be good at sports as well as studies. But, your aims are possible, you know. Start work on body and mind.