Santosh your ews rank for JEE mains is 26715, so your general rank would be around 2,40,000.  So for getting to CBIT through b category,  I would say that your chance for getting a seat in not possible.  As these colleges provide seats irrespective of yout reservation in b category and your general rank is way too high. You need to have it below 50,000 to atleast have a chance.