Firstly, filter out the topics.
choose the right method to create your notes as per your learning style..
make it perfect don't write down everything cover the syllabus with required information that will help you to recall the things quickly..
avoid the mess while writing ... create unit wise notes use headlines, sub headlines, you can use the flowchart..
divide sentence into small paragraphs....
write down the summary of the complete content u mqy write with the different colour pens or you may use the highlighters to mark the important sentence
all then you can create the tables form to make the data precise and short ....
you may draw the diagrams or attach pictures to remember the whole summary u may use mindmaps cluster maps you can use that use graph, charts or you nb ...
may create of your own but make the notes short but sweet firstly read out the notebook or textbook from where you are going to make the notes and then create the sentence in your own words and make the notes that will help you to save your time so your study will be in the effective manner!!!