CBSE 12th

Yes, if you have completed HSC in science.

Yes, you can take NEET exam next year.

For business manager, I would suggest you do BBA after 12th, as here you will learn all about business and can become a business manager.
Good luck.

There is no shortcut to success. You have to work hard. Study more. Concentrate on what you study. Try to write down summary of every topic. Give more labour on maths if you are a Science or Commerce student. Detach yourself from anything else. More of all keep faith in yourself.

If you don't have a college nearby where you can go regularly, it would be better to do a distance course. Such courses are available at IGNOU. You can do Diploma, Certifications and various UG courses like BA. Search for your the nearest IGNOU centre and they will provide you with all the information.

You have many options available with you after 12th. The most common being B.Sc in various subjects, BA in various subjects, BBA, Diploma in medical, agriculture, MBBS, BMS, etc. You can pursue biotechnology at various colleges.

Add details like your academic qualification, state you live in, interests and also age and category. That way, anyone here will give you a detailed answer. But if you want to pursue anything to be successful, I would suggest doing BA or BBA with LLB and then later pursue MBA. This course will be very helpful in securing a good job.

Add details like your current qualification, state you live in or in which you want to pursue the course, interests, etc., then someone here will give you an accurate answer.

MBA via CAT will help you earn instantly and in a year, you can become a millionaire. Only if you work hard and get admission in IIM via CAT.
Pursue B.Tech CSE or IT from IIT-Kharagpur.
Another option is to learn animation and open your own animation studio and then again you will be making money. The key point here is to note that it is the hard work that will make you rich.

You will need 99+ percentile in CAT to get FMS. FMS is usually a top choice just after IIMs. Hence you need to score higher.