Sparx Science automatically provides spaced retrieval for students in the Consolidation section of homework which revisits topics assigned in previous weeks.

40% of the homework in Sparx Science is devoted to Consolidation.

You can control which topics are eligible for Consolidation in the Planner page by clicking "Manage Consolidation topics".

In the window that appears, you can deselect specific topics and these will not appear in the Consolidation of any future homework.