understand for your future review. This also has another advantage, topics involving Math or computation is better learned by practice, repeated practice. When you transfer your notes from your scratch paper to your notebook, it would be like solving them again giving you a helpful review or practice of the procedure/s you used. By that I mean that it would do you good if you will not just transfer your notes, you could solve it once again while transferring them. Transferring of notes could also be done for topics that do not involved computations for the same reason as above, cleanliness. If you are solving problems from test papers containing problems, you could create pocket at the back of your notebook. You could cut out a card board (or any material) and paste (or attach) it there and put in the test papers for easy retrieval and reference during your review. I hope this Google article is helpful to you......