The trimester pattern was introduced for the 9th standard in 2013-2014 academic year.
As already announced by the Directorate of School Educatation, it was planned to implement the Trimester pattern in SSLC from this year ( 2014 - 2015 Academic Year) onwards .
The trimester pattern in Tamilnadu was implemented during 2012-2013 academic year. Its main aim is to reduce book weight of children going to school.
The government has planned to continue the old system till the next decision.