The derivation of the formula should be clear, and each step should start on a new line.

The necessary problem-solving process must not be skipped.

"Because", "So" and preconditions ("known to ……" or "known to ……") should be clearly written.

The answer is easy for teachers to see. It is best to write "A: ……" or "∴……" at the end, and write all the answers.

There are also the following places to pay attention to. The answer steps should be written neatly, usually vertically. If the space in the paper roll is too wide horizontally, it should be divided into two or three columns. Don't write horizontally all the way, and don't divide it into too many columns.

You'd better make a simple plan before writing. Don't write at the back and find that there is not enough space, then draw a series of arrows to "guide" the teacher to find your process and answer. This will make you look confused and annoy the teacher.

Don't omit pictures that need to be illustrated.

That's all I can think of. I hope it helps you.