A diagnostic test is designed to identify what a student currently knows and where gaps exist. It should be used early in a preparation program or whenever progress appears to have stalled.

For example, a diagnostic assessment might reveal that a student performs well on routine mathematics questions but struggles with multi-step reasoning.

The next step is targeted instruction.

A practice test, on the other hand, is designed to strengthen skills and develop familiarity with the assessment format. It becomes particularly useful once students have developed the underlying knowledge and strategies.

Think of the difference this way:

Diagnostic: “What does my child need to learn?”

Practice: “Can my child apply what they have learned?”

Practice tests are most useful when followed by detailed analysis. Simply recording the final percentage does not explain why errors occurred.

After each practice test, categorise mistakes by:

• Knowledge

• Reasoning

• Interpretation

• Accuracy

• Time management

Then use those findings to plan the next study cycle.

A sensible preparation sequence is:

Diagnostic → Targeted teaching → Guided practice → Independent practice → Timed practice → Reassessment.

Using tests this way turns assessment into a learning tool.

The goal is not to maximise the number of papers completed. It is to ensure that each assessment provides actionable information about what the student should do next.