EdReady constantly updates your study path according to the latest information it has about your math knowledge. If you perform less well on some material, it is possible that your study path will expand and include additional units that had not previously been included. Similarly, if you perform better on some material, your study path may get shortened by some number of units.
EdReady will always try to present the most appropriate and efficient pathways to your target score based on the information available at that time. The more you use EdReady, the more accurate EdReady will be.