Later, when you read it again, you are likely to have a fresh point of view. You may see ways to improve it. Try to cut out extra words, make sentences shorter, and make your idea clearer. Have other people read what you have written and make suggestions. Revising should be a regular part of your writing process.
Sloppy handwriting is hard to read.
Your readers won't understand the point you want to make if they can't read the words. To make writing papers easier for you to do and easier for the reader to read, learn to use a word processor. Use a word processor if you have one. It can be frustrating to carefully copy a paper over, using your neatest handwriting, only to discover you left out a word, or want to make a change. You then are left with two choices.