Part of one's memory training in related to how much one can concentrate and focus on the task that needs to be accomplished. If your mind is somewhat disturbed, you are bound to fail on the attempt to remember something.
Let's try a couple of memory-boosting games that can help you remember and focus better:
A task with letters from the alphabet:
This other memory game is much more complex for one's memory, but it is a grade brain gym to exercise one's remembering skills. See if you are able to undergo this brain exercise related to people's face's pictures successfully.
If you think that the previous exercise was a difficult task, this other one with words is way more complicated with the more words you try to remember. Although some people can really remember an infinite number or words, it takes a great short-term memory to achieve this other task.