Many of us find it very difficult to memorise and even burning midnight night oil once memorised the retention rate is very low. If you are suffering from the same issues you are not alone.As per survey and expermiment a kid is very much capable of memorising things so be like a kid lets see how. Make the concept or long paragraph related to a story means as if you were there to witness all of those what happened this can come very handy for history and other subjects filled with long deacriptive type of data.make bullet points in your mind and try to recall them make this a practice and you would never suffer from these issues.