1d081462_Some_Clarifications___WBXPress__Clarifications
[Points of doubt] (b) An Assistant Teacher was appointed to the post of Assistant Headmaster after 01.01.2006 and again he got appointment subsequently to the post of Headmaster. How his pay will be fixed? [Clarifications] 
In this case if the appointment to the post of Headmaster was made within 27.02.2009, the said teacher may opt for the revised scale from the date of appointment to the post of Headmaster directly after remaining in the unrevised scale till his such appointment. He may then get entry-point pay in the Pay Band for the post of Headmaster in the revised scale or otherwise, as the case may be, as per pay in the post of Assistant Headmaster in the unrevised scale, whichever is more, in terms of revised pay-structure and in addition he will get Grade Pay / additional Grade Pay. The said teacher also may opt for the revised pay structure taking his revised scale of pay for the post of Assistant Headmaster and his pay then will be fixed as per Item No. 7 of the Clarifications. After his appointment to the post of Headmaster, his pay will have to be fixed as per Item No. 8 of the Clarifications.
Pay Fixation of Teacher - Some Clarifications – WBXPress
Clarifications