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The parallel higher level Red books in the Catalyst series use the same format as the Green books. This text also includes hands-on activities, summaries, and in-text questions to help pupils consolidate their knowledge.

The Green books in the Catalyst series are designed to motivate lower-ability students. This text also includes hands-on activities and thought-provoking plenaries.

The parallel higher level Red books in the Catalyst series use the same format as the Green books. This text also includes hands-on activities, summaries, and in-text questions to help pupils consolidate their knowledge.

The parallel higher level Red books in the Catalyst series use the same format as the Green books. This text also includes hands-on activities, summaries, and in-text questions to help pupils consolidate their knowledge.

The Green books in the Catalyst series are designed to motivate lower-ability students. This text also includes hands-on activities and thought-provoking plenaries.