Hi Udit,

This is because public users have no access to that page. So You have to give access rights to group_public  in the models used in that new page. You can add a csv like this from custom module or you can add it from UI,

activate the developer mode then, Settings -> Technical -> User Interface -> Security -> Access Controls list

id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
view_course_admission,view.course.admission,model_course_admission,base.group_public,1,1,1,1

Thanks