Associate something you are trying to remember with a visual item that is unusual or quirky. For example, imagine a skydiving mule to associate F=ma^2. Also, it must be repeated in order to strengthen and solidify. Repetition is important for firmly lodging an item into memory. Do so over several days, not the same day. Other examples: suppose you need to memorize the acronym GRHM, you would visualize a GRaHaM cracker. Or phrases: Old People From Texas Eat Spiders == Frontal, Parietial, Occipital canial regions.