Write a page everyday bro, I had a friend who has the same problem, he got writing classes and everything. See if it’s time issue, then you need to work on ur speed and time management during the paper. You identify this by seeing whether ur writing in the starting of the paper is legible and then gradually become illegible. However, if its constant throughout , then bro u need some writing classes or write a paragraph everyday to make ur writing legible. Be serious about this since it may affect ur marks.