Hello Ray Rahul! 
Thanks G Shwetha for the information. 
But, at times, some private institutions start their application procedure way before the declaration on results (of CBSE or State Board). They ask for your Admit Card and Board Roll number. 
So be on a look out for the application forms beforehand. 
Wishing you all the best! 

Good afternoon ,
Once the results of 12th board exam conducted by ISC ,CBSE or State boards are released,within a week or 2 weeks the Institute or colleges would release the application forms respectively as well as please do check the eligibility criteria before filling up the form .For more information regarding this,please do comment below and hope this information is helpful.
Thank you!