u/DrySubstance2622

I'm a general category candidate want to apply for RBI grade B exam. I know I can't make it. I want to appear. But the application fee is 1000rs for general. Is it okay to apply opt SC or ST as fee is less. I just want to sit for prelims. Application number is not asking. Also my doubt is, will there be any problem with other exams, if I apply like this in this exam. I mean does IBPS match all application forms I've applied through adhaar or etc?