Hey Raju!

BBA course is equivalent to graduation so it can be pursued after 12th only. If you are too eager to get into this, then you can do diploma in business administration (3 years) then you can go for BBA (lateral ) which is of 2yrs only. 

But I would suggest you to complete your studies till 12th and then go up for BBA course .Also some good colleges are- Sri Ram college of commerce, Delhi 

Delhi Lady shri ram college for women, Delhi 

Hansraj college, Delhi 

Hope you find it helpful :)