There is a universal saying that practice makes perfect, however I think appropriate practice makes perfect considering to training technique, training volume and other reasons.
Practice can make you remember and understand something new, but inappropriate practice may make your effort useless or even lead you to the opposite direction.
Therefore, before your practice, you should think about whether your method, plan are appropriate or not.
Only the appropriate method and plan help you get what you wish.
Practicing oral English, for instance, if you say a word in a poor pronunciation, no matter how many times you say it, you will never pronounce it correctly.