Read the revision notes one at a time, with a quick check after each one. Get one wrong and you can look back at the note and try again, then there's a final round of the ones you missed.
Databases
Why records are used
A record in a 1D array
2D arrays
2D array indexes
Searching a table held in a 2D array
Condition-based array processing
Totalling and updating numeric fields
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