How difficult is the SAT Chemistry test?

So I take the SAT chemistry test in a week. I’m incredibly stressed out about it. I have a book, but I haven’t had that much time to study due to school, sports, work, etc. I took general chemistry at the university of minnesota last semester and am taking the second part this semester. I did well in that, but I don’t think that will be enough to do well on this test. I’m doing as much work in the prep book as I can this week, but again, that doesn’t seem like enough. So my question is, how hard is this test? My goal is to get a 750. Is that totally unreachable? I am applying to Harvey Mudd, so you can see why I feel so much pressure to do well on this test.
Thanks!