There are different 'study' types. Meaning that one can easily memorize things by reading, another one by listening, another one by speaking or so. Usually, people are a mix of these types but have a stronger focus on reading (for example).
You can find tests online, which show you what kind of study type you are. Further, you can find lots of tips online, which help you to study the 'right way' based on your study type.
For me personally, reading and repeating verbally worked for me the best always.