I sorta have the time.. but I'm not sure if people want me proofing.. yet.
Just proofread the second half of the chapter.
I can take it as 50% of the test. Honestly wouldn't mind having you in the team. You look like a reliable person anyway. Even if you weren't as good as proofreader as we need (but you might be), I know you can do a lot more.
Just take the .docx and do what you want with it, even changes in storytelling if you feel something is wrong. Use the Word functions for reviewing and activate "track changes". Use the comment system for more indepth stuff, if needed.
In FoOls we use similar systems in the wiki, but not so cool as those in word...
EDIT: DON'T FORGET TO REDOWNLOAD THE LATEST VERSION! I actively update it, without saying it.