CBSE 12th

According to me, you can opt for B.Com, you will get the knowledge of accounting, taxation, costing and valuations in this course. These will help you to get into fields of banking and job profiles like accountant and auditor. After B.Com, you can go for MBA in finance or banking/finance/insurance, this will strengthen your knowledge and you will get a higher job profile.
If you have interest in designing then you can also opt for BA in interior designing or fine/arts. BA in economics/history/social sciences are other good options. All these graduation streams will be more beneficial if you pursue Masters afterwards.

No, you will have to try next year for the same.

Hi,
You should follow your interest.
You may not realize it now, if you make a wrong decision now you will regret for the rest of your life.
Take up engineering or science only if you genuinely are interested, otherwise this will be a big mistake of your life. For example, many people take mechanical engineering and end up in an IT company. That's just totally a waste. So, choose wisely.
Study/take up that course which you will enjoy studying and working.

You are eligible fro GNM only, for B.Sc. you need 12th standard with PCB.

You can apply for B.Com, BBA, CA, ICWA or B.Sc. in hotel management.

Yes, you can. Your 12th marks with good percentage is enough.

Hi,
It depends on your interest. If you are good at technical then go for engineering like BE, B.Tech, Diploma, etc. whereas if you are interested in medical then you can appear for NEET entrance exam and take admission for MBBS or dental. You can also do B.Sc. in various options like IT, pharmacy, nursing, etc. There are many doors open or you.
All the best.

Hi,
No college can be good without mathematics in BCA course. You may try distance education.

Other than medical science, the most preferred branch is engineering. If you are not interested for that also you can go for B.Sc. All the options have very good career prospects.