I had thought originally neuroplasticity would occur if the brain was still "growing". There is a PBS Frontline site that did a special recently on the Teenage Brain . It is very interesting what the neuroscientist are discovering. It mentions brain shaping and pruning during this time.

If the working memory is poor, I had thought many cope by creating a schematic map as a form of reference until it is stored in long term memory (?) That is just my hunch....