Age limit for a child to be eligible for madhyamik exam

A student who has completed 13 years of age as on 31/10/2016 ( i.e., who was born on or before 31/10/2003) is eligible to appear at MP, 2018 (i.e., a student studying at Class IX this year).

Thanks both of you, sir. But as SSA guidelines, a student of class 5 have to be 6 years old and so on.I think these rules do not match with each other. Please clarify.

a student of class 5 have to be 6 years old

This is not correct. A student of Class I needs to be of 6 years old as per RTE , a student of Class V, thus, should attain 10 years of age.
So a student of Class IX normally crosses the Border of 13 years of age during Registration. Moreover, this present criteria of age has come into effect from 2013. So the age restrictions for MP may also be revised in future, when this batch would appear in MP.