1d081462_Some_Clarifications___WBXPress__Clarifications
[Points of doubt] 6. How additional Grade Pay for taking higher responsibilities of Head Teacher (Primary School), Headmaster/ Headmistress, Assistant Headmaster/ Assistant Headmistress of the Schools of different nomenclature will be regulated in the revised scale in the case of existing teachers? [Clarifications] 
The term “existing teachers” means those who are in service on or before 01.01.2006.Additional Grade Pay is a new concept in the revised pay-structure for taking higher responsibility. The benefit of additional ‘Grade Pay’ will be admissible to the existing Head Teacher, Primary School, Assistant Headmaster/Assistant Headmistress, High School (V-X), Headmaster/Headmistress, Assistant Headmaster/ Assistant Headmistress, Higher Secondary School (V-XII), Headmaster/Assistant Headmaster, Junior High School(V-VIII), irrespective of their dates of appointments to such posts notionally with effect from 01.01.2006 and actually with effect from 01.04.2008.Such existing teachers as per their option on any date on and from 01.01.2006 to 27.02.2009 may be allowed to fix their pay in the revised pay structure along with additional Grade Pay which is admissible to them for taking higher responsibility as mentioned above.
Pay Fixation of Teacher - Some Clarifications – WBXPress
Clarifications