I've been wondering if it's advised to do all problem sets associated with a lesson before moving on to the next lesson, or if the problem sets are there for us to utilize later in the curriculum as a refresher. I understand that this could be entirely subjective and based on the individual, but was curious to see how others approach the problem sets. I've been completing at least half of the problem sets associated with the given lesson before moving on, while saving the rest for later after completing the course to drill and test my ability to remember how to attack the various question types.