I kind of know how you feel, four weeks ago today my dad's aunt died in Ireland and we were really close, I was like a granddaughter to her since all my grandparents have died. On Tuesday morning I had an A Level and literally straight after I had to leave school for the airport, having a mass that evening. I came home on the Thursday and had to go to a practise for my Grade 7 flute exam that Saturday, as well as having another A Level on Friday. It was a week of hell as you're so stressed about exams and have to deal with such a loss that would depress you anyday, let alone at such a critical point in your education. I didn't tell any staff about it because I hate the thought of crying in front of people, but I'd advise you to as it's less of a burden if you know you're not so disadvantaged and people can help you e.g. special consideration, and I'm sure you know it's impossible to revise at a time like this. Good luck, I hope it all goes well for you.