When you use a pen you can erase some mistakes but your work will not be neat
Mechanical pencils have cleaner lines. The separate eraser allows you to erase more cleanly
Write vertically instead of horizontally. This allows you to present a more understandable work.
After doing different activities during the day it is not easy to concentrate at night because of tiredness. This may leads to make mistakes when working on problems. It's better to get a good night sleep and to wake up refreshed during the mornings. You'll find yourself in better shape to work on problems
Some math subjects such as Geometry and Trigonometry involve drawing shapes in order to solve problems. Other subjects such as Algebra are more abstract. However any mathematical concept or problem can lead to a visual representation. The visual representation allows to understand the problem more clearly.
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