Proofreading is the final stage of the editing process and it is not the time for making major changes. If your work needs this then you should think about getting it copyedited first. Proofreading is about giving your work that professional polish and helping to make your material fit for purpose.
When working on your document I will do the following:
•Correct spelling, grammar and punctuation
•Ensure consistency of style and usage of the above within the document
•Check that page numbers and headers are correct
•Check that tables, illustrations and captions match and are clear
•Check that page numbers in the table of contents match the text
•Ensure that the house or chosen style is followed throughout
For further information, the CIEP website provides an excellent description of the role of a proofreader.