Memory can be trained and improved significantly with practice. I don't know what working to suggest to you when it comes to Magick, but if you want a better memory you should simply challenge it often. Take 15-30 random numbers, memorize them, and then say them backwards, this is an excellent exercise. Or read a text and then repeat it in reverse, starting from the last sentence. I'm a firm believer in the fact that not only our memories, but all our intellectual faculties in general can be significantly improved with training, no matter what 'experts' like Juden Peterstein claim. Pattern recognition, memory, spatial awareness, logic, I'm truly convinced that these can be improved with regular practice.
The jews have always known this. You can say a lot of things about the jews, but they are not dumb and they do not waste time. There is a reason why they've always put a tremendous amount of focus on Chess and the development of the mind in general. The father of a very famous jewish Chess player publicly stated this, that cognitive faculties can be significantly improved with practice, and he showed this by training his daughter and making her an extremely strong player.
It just makes sense. The mind is a muscle. We all know that focus can be improved tremendously, so can visualization and any other skill, why wouldn't it be the case for other mental faculties? By using and challenging any mental faculty regularly, it will get better.
Now, I also do recognize limits and natural talent. I'm not saying that a 85IQ person can become a 150IQ genius, but I'm saying that significant improvement can be made, significant enough to make the training worth it.
Chess, Math, studying complex languages like Latin, training your memory with techniques I mentioned, solving complex problems etc. These things will actually develop the mind beautifully. The amazing thing is that all of these faculties are interconnected, so by improving one, you improve all your faculties all around.
Getting dumber and dumber because of not challenging the mind enough is a very real thing, staying sharp is essential.
These are all just my opinions. Many 'experts' would disagree. I would just want to point out to you that these 'experts', and the people who own them, want to keep humanity as dumb as possible, so if brain-training actually worked, they would never tell you about it.
Sorry if I went off topic.