| Year | First Half | Second Half |
|---|---|---|
| 2015 | June | December |
| 2016 | June | December |
| 2017 | June | December |
| 2018 | June | December CBGS December CBCS |
| 2019 | June CBGS June CBCS | December CBGS December CBCS |
| 2020 | December CBGS December CBCS | |
| 2021 | June(R-2019 ‘C’-Scheme) | December CBGS December CBCS |
| 2022 | (ECS)June(R-2019 ‘C’-Scheme) | (ECS)December(R-2019) |
