CBSE 12th

yes u can get admission in private colleges.but not in nit.all the best.:-)

CA requires lot of patience and hardwork as the success rate is merely 3 % every year and thousands of students do it. While one can not map the human potential ever, you can be the best judge as per your capabilities. There is no age bar to pursue it. The best way is to go through the course in details for all the levels and decide.
All the best

don't ask in public .although its illegal bt nthng is impossible in india

No Nits. Try for Private College. you will Get .if you belongs to Any reserved quota then you may wait for any last round. But I suggest go for Private College.

max of 200% cut off is required.based on caste the percentage varies.

yes!!!.it's a perfect selection after completing 12th than choosing engineering.the scope in agricultural fields are more which will help to make modern agriculture system.

To get a call from IIMs, the most important component is CAT score. Try to score as much as possible. If you can score 100 percentile, we will get call from all IIMs. Coming to your second question about maths, you have to prepare for quants. If you can prepare well for quants and score very good in verbal & LR, you can get 99+ percentile. This is much needed for IIM calls.

it solely depends upon what would you want to do next.if u have a business or u need a basic knowledge of business world.bbm-ib.will be suitable.but if u r looking it for a career .it may not work for u because post this u will have to do MBA if u dont want to start slow which u wouldn't coz u scored 82 which is pretty good.and the good colleges look up for students with good spoken english.hope it helps.:-)