Choose the side that you can support best. Use strategies that are primarily logical, not emotional. Use transitions such as however , and similarly within and between paragraphs. Leave time to read over your paper. You can find and correct many simple mistakes this way.
Some practical matters Write legibly.
If your handwriting is large, write on every other line so that you can make legible changes. Beware of the temptation to write quickly and leave early. You will do much better if you take your time.