Read the brief and locate the targets
Every exercise marks its required output cells in green. Start by identifying which columns contain inputs and what each target means. For cafe revenue, for example, the target combines quantity and unit price rather than repeating a known total.
You may edit other cells to explore the calculation, but the checker uses its own original and variant input sets. Only the target formulas are carried into those cases. This keeps a convenient edit to an input from becoming a shortcut through the exercise.
Check behavior, not just appearance
A fixed value can match the visible example by coincidence. The checker requires a formula and changes the underlying inputs in four additional cases. It reports each failed cell and case so you can identify a broken reference or missing branch.
Different supported formulas can pass the same task. There is no requirement to reproduce the worked solution character for character. The checks are finite evidence, so passing them does not claim universal correctness for all possible business data.
Use hints and solutions deliberately
A hint explains the relationship without filling the grid. The working-solution control loads one supported approach and labels the run as assisted. Read the formula, reset the exercise and try writing your own version.
The exported check report contains the tested cases. Keep it beside the workbook when you want a reproducible record of what the formula was asked to do.