Answer:for a long term retention the better way is to spread out learning over time and repeatedly test yourself .
Explanation:Cramming is usual a temporary method of acquiring information because usually that information is not restored as something that one truly knows or understand ; it is like coping and pasting in your brain it can be erased anytime when the new information comes.
When someone spread their learning material and learn it piece by piece it gives them the ability to actual learn with understanding because they are not taking a lot of information at once hence makes it easier to grasp what they are learning.
Testing oneself always confirms what they understand and what they still don't understand.