How to deal with father after exams?

I had my 9th grade finals a few weeks ago. I got my result but haven't told anyone till the official date for the result comes. My father always compares my grades to my elder sisters' who got straight A*s. I dont have a SINGLE A* and he's expecting all 8 to be those. I know he'll lose how temper and start shouting and saying i wasted my time and didn't study till i start crying and he gets even madder, even though i studies so much i didn't have time to shower even.

How to deal with father after exams?
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