From scratch means that you will get a paper where 100% of the words will be written by the writer. Also, revision means that you provide your already written paper to make changes, add the text, and correct something with up to 70% of the word count of the final version of the paper to be written by the writer. Consequently, the proofreading option is usually selected by those who want to check grammar, and spelling or maybe correct some minor aspects of the paper, as only up to 40% of the content of the final product will be written by the writer.