Dear Ranjan ,

No you can't change your board name once you filled the application.You should t ry contacting them by email , phone. Or when you go for spot verification tell them . they will surely help you out,Isuggest you inform them as soon as possible,

please go through the link i am providing

link:" https://jeemain.nic.in/WebInfo/Public/View.aspx?page=80 "

Hope it helps!