How are you? I imagine you’ve had an eventful first week back, especially as you’re now in your OWL year. Just try to keep your head down, and work hard. Fifth year always sends a few people a bit crazy, but you just need to keep it in perspective - you’re a perfectly capable wizard, and OWLs aren’t the be-all and end-all of your entire life. Perhaps you should pass that advice onto Hermione as well, as I imagine she is feeling the pressure.