Your question regarding leave can be answered as follows:
Leave with wages in S&CE Act is, where an employee is eligible for 1 Leave with wages after every 20 working days in case of adult, 1 day every 15 days in case of young person. For more information refer: S&CE Act-Chapter IV.
As per act an employee will be eligible for following leaves
Earned / paid Leave - 1 day leave for every 20 working days, which will be credited to leave account in next calendar year. Leave calculation period will be calendar year.
Casual Leave - 12 days leave per annum
Both the leaves are calculated on pro-rata basis.
Hope this helps.. If you find I am wrong please update