Not everybody can learn easily. Some people are blessed with sharp minds and keen comprehension that they literally just skim through whatever lesson they are learning and the information is pretty much embeded in the memory. When needed, it is as if the person reporting or answering the exam is simply reading the answers.
There are also slow learners. Usually they are more inclined to the arts. They are visual so they can work more by seeing what they are working on. Hence, in learning academic subjects it takes time to process because most of what is learned are written in words or numbers. What is needed is something visual to teach those who are taking more time to process the information. flashcards will surely help.
Remember when you were starting school and all you had were flashcards? They work especially for minds that are having difficulty to understand big words and numbers. One side of the card is the problem and the other side is the answer. As much as possible you declare the answer without having to look at the back. Repetition is the key. As often as you see it, the idea will etch in your mind. It’s time to create flashcards.