EWS Certificate kaise lagau

Jan attempt ke registration ke time pata chala ki ews ya kisi bhi category ke liye certificate id lagegi, maine next day hi apply kar diya par jab tk wo ban ke aaya tab tak registrations close ho chuki thi, jab reopen hua tha category change karne ke liye uske close hone ke agle hi din ban ke aaya (unlucky me). Phir socha April attempt ke time change kar lunga category par ab registration mein change karne ka option hi nahi aa raha. Pls help me out agar kisi ko kuch pata ho to