When you need to study hard you could try this color palette. You can color for 15 minutes before you start studying, or you can have a little break and use it for coloring.
This palette will help you to absorb new things and assists you to focus on your studies. It gives you more motivation. Also, it refreshes your mind and enhances clear thinking.
This palette has a very optimistic character, so it is overall very useful when studying. It is especially suitable when you have learning disability or are exhausted from studying.
I recommend choosing a picture which to you represents growing or going onward.
Book: Mental Images vol 1 colouring book