Now I remember

I tend to have a bad habit of memorizing things, somethings just don't stick to me and it ends up being hard for me when it comes to taking test. I try a couple of things to make things stick to me for example the way I memorize my vocabulary words is by making flash cards but it doesn't always help. You can be telling me something and it either sticks to me or by the end of the day I will just forget and not remember anything.