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I combine both ways of reading/listening to make it well in my exams but if i must pick between the two thwn i will definitely go for reading.

Reading notes that i have never been lectured on has not always been a major problem for me and most people i believe. You can easily understand them and still make a good pass in your exams. I think that is why at the higher institutes, reading as a tool of research is mostly used. Lecturers hardly say much and you as a student do a pile of the work by reading and trying to understand on your own because at that level that is what is expected of you.

As for listening, i for one enjoy listening to my lecturers but to be honest if i should depend on that to make it in exams then my chances are very slim. I easily forget it and to remember what i listened to is a little more difficult as compared to recalling what i read. So for me, if i was to grade my pass in an exam as 100%, 70% will be because i read and the remaining 30% because i listened.

So it is reading for me but i must conclude by reiterating that it takes both to make a complete student or learner.

For me, it has always been reading as it requires me to concentrate much more on the subject matter than while listening. I noticed that when just listening, I can get carried away by other thoughts that might not be relevant to what I'm doing or background noises and other sounds in general that tend to grab my attention. 

While I'm reading though, I somehow access a superpowers that allows me to eliminate most, if not all of the unnecessary thoughts/sounds that lower my attention while listening, and concentrate on what I'm reading with my fullest capacity.  

For me, reading and listening are both closely related, both need each other, reading and listening have a connection to achieve better understanding. although there are some who say that "hear us remember, see we forget" but that is only an opinion, and all these things go back to our personal understanding.