I too have this problem which is immensely frustrating. I don't think I ever learned to study properly.
I have just started trying out different techniques to study better; skim reading page structure first etc. I also downloaded Balabolka so I can convert text to audio files so I can listen along whilst reading. I've also started using the method of loci, which is great, but not sure how to expand it to larger sets of things to remember.
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Diagnosed Aspie.