Thx for Ur answer but I have some further  queries like will there be any problem as i had once registered mysefm as a regular cbse candidate in JEE main this year ( though I didn't went to attempt it due to my health) moreover, plz don't take it otherwise but since I'm presuming that you aren't from the teaching background or associated with any educational or academical authoratative body so are u sure abiab the current rules and regulations ? If possible , so could you plz provide me with some excerpts or guidleguid associated with this from the ofvioffi page of any of the concerned board or institute? ( Plz note that this question surfaces in my mind from the fact that I'm in deep mental agony and anxiety these days)