Passive studying merely involves purely reading your notes or reading just the text. Many says its quite not good and I agree because when I read my own notes I spend many hours understanding and thinking what I have just written. Basically because my own notes were written in the manner only me can read and worst sometimes I too could neither read them. So I end up wasting too much time on some part that I was unable to further my readings or even finish it in one sitting.
Another worst experience from adopting the passive studying methods is it makes me so sleepy. Hence I end up sleeping and waking up without retaining what I have read. This gives me trouble because I have to cram studying in the morning, skip my breakfast so I can get to school on time and fail to get an impressive test result.