Loss of pay rules for study

sir,

i am n srinivas, working as a junior asst. in cantonment board, secunderabad,

i am completing my probation period ( 2 years) by this month,  At the time of joining (2012) i am discontinued from my studies,

now i would like complete my studies(mca).

i already know ccl rules for study (not less than 5 years service)

is there any rule/way to take 2 years long leave as loss of pay/ study leave after completing my probation period

please help me in this regard.....

thanking you sir.....