| Class 1 | Annual | Half Yearly |
| Class 2 | Annual | Half Yearly |
| Class 3 | Annual | Half Yearly |
| Class 4 | Annual | Half Yearly |
| Class 5 | Annual | Half Yearly |
| Class 6 | Annual | Half Yearly |
| Class 7 | Annual | Half Yearly |
| Class 8 | Annual | Half Yearly |
| Class 9 | Annual |
| Class 1 | Annual | Unit Test IV | Half Yearly |
| Class 2 | Annual | Unit Test IV | Half Yearly |
| Class 3 | Annual | Unit Test IV | Half Yearly |
| Class 4 | Annual | Unit Test IV | Half Yearly |
| Class 5 | Annual | Unit Test IV | Half Yearly |
| Class 6 | Annual | Unit Test IV | Half Yearly |
| Class 7 | Annual | Unit Test IV | Half Yearly |
| Class 8 | Annual | Unit Test IV | Half Yearly |
| Class 9 | Annual | Unit Test IV | Half Yearly |