P.G.Assistant on 19.09.1986. From 12.09.1996, the said school had been upgraded as a higher secondary school by virtue of G.O.Ms.No.206, Environment and Forest Department dated 12.09.1996. The petitioner would submit that under the Tamil Nadu Forest Subordinate Service Rules, there was no Rule or qualification for the post of higher secondary school headmaster, as the service rules contain only upto the post of Post graduate assistant. After the upgradation of the school, the petitioner claimed promotion to the post of headmaster. Since a charge sheet was pending against him under Rule 17(b), he was not promoted and his junior was promoted as higher secondary school headmaster. Thereafter, the charges framed against the petitioner were dropped and the juniors who were promoted as headmasters were reverted. The petitioner was promoted as Higher Secondary School Headmaster on 30.05.2004. Subsequently, the Government had issued G.O.Ms.No.66, Environment and Forest (F.R.1) Department, dated 07.07.2006 which contained Adhoc Rules, which were deemed to have come into effect from 08.02.1992. Under