You dont need to worry about getting admission in private engineering colleges they will accept you ews certificate also for getting admission to most of the private colleges you dont need ews certificates as they have provision of direct admission as well through management quota yes your ews certificate can only help you in a way to get a fee concession if possible at these colleges otherwise getting admission here is not a very tough task and if you are getting admitted to these colleges by uptu counselling then you may require your ews certificate