Revalidation of registration

hello all i have a query ..i registered in final course on 25-2-11 nd today i filled my exam form nd not face any problm in filling exam form..my question s this on 25 -2-16 my final registration s expire after 5 year so it is worth to revalidate registration or not ?? nd also tell my resuld witheld by icai if i not registered again ?? i m vry confused now...nd sm person told that u cant get degree if u suceed in exam if u not revalidate...plz tell me a proper solution what to do now plzzzzz