Dear KOUSTUVA07,
An HM may be the Secretary or Joint Secretary, according to his designation. But a TIC can not hold the same post. Is he/she resigned from his/her T.R. post ? If such happened ( resigned from the post of TR), then the committee ought to select another member of T.R from other teachers by election (not to co-opt.). Now you know that the existing M.C. is continued till to further M.C. formation. ( in order to being converted to Sponsored School). So, the present situation, the matter should be ignored and wait for the order to reconstruction of the MC.